Claims Analysis
Total Claims: 78
Claim 1
Independent Claim
62 words
A method for stabilizing Tumor Necrosis Factor, which comprises adding to an aqueous solution or powder containing Tumor Necrosis Factor an effective amount of a stabilizing agent selected from a nonionic surfactant, at least one substance selected from the group consisting of D-glucose, D-galactose, D-xylose, D-glucuronic acid, a salt of D-glucuronic acid, trehalose, a dextran and a hydroxyethyl starch, and mixtures thereof.
Claim 2
Independent Claim
62 words
A method for stabilizing Tumor Necrosis Factor, which comprises adding to an aqueous solution or powder containing Tumor Necrosis Factor an effective amount of a stabilizing agent selected from a nonionic surfactant, at least one substance selected from the group consisting of D-glucose, D-galactose, D-xylose, D-glucuronic acid, a salt of D-glucuronic acid, trehalose, a dextran and a hydroxyethyl starch, and mixtures thereof.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein said stabilizing agent is a nonionic surfactant.
Claim 4
Dependent Claim
21 words
A method according to claim 2, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 5
Dependent Claim
46 words
A method according to claim 2, wherein said nonionic surfactant is added in an amount of about 1 μg to 1 mg per ml of the aqueous solution containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml.
Claim 6
Dependent Claim
21 words
A method according to claim 4, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 7
Dependent Claim
22 words
A method according to claim 4, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml.
Claim 8
Dependent Claim
21 words
A method according to claim 6, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 9
Dependent Claim
18 words
A method according to claim 2, wherein said nonionic surfactant has an HLB value of 9 to 20.
Claim 10
Dependent Claim
46 words
A method according to claim 8, wherein said nonionic surfactant is added in an amount of about 1 μg to 1 mg per ml of the aqueous solution containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml.
Claim 11
Dependent Claim
21 words
A method according to claim 9, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 12
Dependent Claim
22 words
A method according to claim 9, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml.
Claim 13
Dependent Claim
21 words
A method according to claim 11, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 14
Dependent Claim
18 words
A method according to claim 2, wherein said nonionic surfactant has an HLB value of 13 to 18.
Claim 15
Dependent Claim
46 words
A method according to claim 13, wherein said nonionic surfactant is added in an amount of about 1 μg to 1 mg per ml of the aqueous solution containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml.
Claim 16
Dependent Claim
21 words
A method according to claim 14, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 17
Dependent Claim
22 words
A method according to claim 14, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml.
Claim 18
Dependent Claim
21 words
A method according to claim 16, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 19
Dependent Claim
75 words
A method according to claim 2, wherein said nonionic surfactant is selected from a polyoxyethylene fatty acid ester, a polyoxyethylene alkyl ether, a polyoxyethylene alkylphenyl ether, a polyoxyethylene sorbitan fatty acid ester, a polyoxyethylene glycerin fatty acid ester, a polyoxyethylene hydrogenated castor oil, a polyoxyethylene castor oil, a polyoxyethylene polyoxypropylene alkyl ether, a polyoxyethylene polyoxypropylene block polymer, a sorbitan fatty acid ester, a sucrose fatty acid ester, a glycerin fatty acid ester and mixtures thereof.
Claim 20
Dependent Claim
46 words
A method according to claim 18, wherein said nonionic surfactant is added in an amount of about 1 μg to 1 mg per ml of the aqueous solution containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml.
Claim 21
Dependent Claim
21 words
A method according to claim 19, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 22
Dependent Claim
22 words
A method according to claim 19, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml.
Claim 23
Dependent Claim
21 words
A method according to claim 21, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 24
Dependent Claim
326 words
A method according to claim 2, wherein said nonionic surfactant is selected from a polyoxyethylene fatty acid ester having a saturated or unsaturated fatty acid residue with 8 to 20 carbon atoms in which the number of moles of added ethylene oxide is about 4 to 50, a polyoxyethylene alkyl ether having a saturated or unsaturated alkyl group with 8 to 20 carbon atoms in which the number of moles of added ethylene oxide is about 5 to 55, a polyoxyethylene alkylphenyl ether having a saturated or unsaturated alkyl group with 5 to 10 carbon atoms in which the number of moles of added ethylene oxide is about 5 to 55, a polyoxyethylene sorbitan fatty acid ester having a saturated or unsaturated fatty acid residue with 8 to 20 carbon atoms in which the number of moles of added ethylene oxide is about 5 to 50, a polyoxyethylene glycerin fatty acid ester having a saturated or unsaturated fatty acid residue with 8 to 20 carbon atoms in which the number of moles of added ethylene oxide is about 5 to 50, a polyoxyethylene hydrogenated castor oil or polyoxyethylene castor oil in which the number of moles of added ethylene oxide is about 20 to 150, a polyoxyethylene polyoxypropylene alkyl ether having a saturated or unsaturated alkyl group with 12 to 18 carbon atoms and having an ethylene oxide content of about 65 to 85% by weight, a polyoxyethylene polyoxypropylene block polymer having a number average molecular weight of about 3,000 to 15,000 and having an ethylene oxide content of about 65 to 85% by weight, a sorbitan fatty acid ester which is a mono- or sesqui-acid ester of sorbitan with a saturated or unsaturated fatty acid having 8 to 20 carbon atoms, a sucrose fatty acid ester or glycerin fatty acid ester which is mono-acid ester of sucrose or glycerin with a saturated or unsaturated fatty acid having 8 to 20 carbon atoms, and mixtures thereof.
Claim 25
Dependent Claim
46 words
A method according to claim 23, wherein said nonionic surfactant is added in an amount of about 1 μg to 1 mg per ml of the aqueous solution containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml.
Claim 26
Dependent Claim
21 words
A method according to claim 24, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 27
Dependent Claim
22 words
A method according to claim 24, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml.
Claim 28
Dependent Claim
21 words
A method according to claim 26, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 29
Dependent Claim
115 words
A method according to claim 23, wherein said nonionic surfactant is selected from a polyoxyethylene sorbitan fatty acid having a saturated or unsaturated fatty acid residue with 8 to 20 carbon atoms in which the number of moles of added ethylene oxide is about 5 to 50, a polyoxyethylene hydrogenated castor oil in which the number of moles of added ethylene oxide is about 20 to 150, a polyoxyethylene castor oil in which the number of moles of added ethylene oxide is about 20 to 150, a polyoxyethylene polyoxypropylene block a average molecular weight of about 3,000 to 15,000 and having an ethylene oxide content of about 65 to 85% by weight, and mixtures thereof.
Claim 30
Dependent Claim
46 words
A method according to claim 28, wherein said nonionic surfactant is added in an amount of about 1 μg to 1 mg per ml of the aqueous solution containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml.
Claim 31
Dependent Claim
21 words
A method according to claim 29, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 32
Dependent Claim
22 words
A method according to claim 29, wherein the amoung of said nonionic surfactant is about 5 μg to 100 μg per ml.
Claim 33
Dependent Claim
21 words
A method according to claim 31, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 34
Dependent Claim
48 words
A method according to claim 28, wherein said nonionic surfactant is selected from polyoxyethylene (20) sorbitan monooleate, polyoxyethylene (60) hydrogenated castor oil, polyoxyethylene polyoxypropylene block polymer having a number average melecular weight of about 8,350 and having an ethylene oxide content of 80% by weight, and mixtures thereof.
Claim 35
Dependent Claim
46 words
A method according to claim 33, wherein said nonionic surfactant is added in an amount of about 1 μg to 1 mg per ml of the aqueous solution containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml.
Claim 36
Dependent Claim
21 words
A method according to claim 34, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 37
Dependent Claim
22 words
A method according to claim 34, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml.
Claim 38
Dependent Claim
21 words
A method according to claim 36, which further comprises subjecting to lyophilization the aqueous solution having said nonionic surfactant added thereto.
Claim 39
Dependent Claim
38 words
A method according to claim 1, wherein said stabilizing agent is at least one substance selected from the group consisting of D-glucose, D-galactose, D-xylose, D-glucuronic acid, a salt of D-glucuronic acid, trehalose, a dextran and a hydroxyethyl starch.
Claim 40
Dependent Claim
20 words
A method according to claim 38, which further comprises subjecting to lyophilization the aqueous solution having said substance added thereto.
Claim 41
Dependent Claim
45 words
A method according to claim 38, wherein said substance is added in an amount of about 10 mg to 500 mg per ml of the aqueous solution containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml.
Claim 42
Dependent Claim
20 words
A method according to claim 40, which further comprises subjecting to lyophilization the aqueous solution having said substance added thereto.
Claim 43
Dependent Claim
21 words
A method according to claim 40, wherein the amount of said substance is about 100 mg to 500 mg per ml.
Claim 44
Dependent Claim
20 words
A method according to claim 42, which further comprises subjecting to lyophilization the aqueous solution having said substance added thereto.
Claim 45
Dependent Claim
11 words
A method according to claim 38, wherein said substance is trehalose.
Claim 46
Dependent Claim
45 words
A method according to claim 44, wherein said substance is added in an amount of about 10 mg to 500 mg per ml of the aqueous solution containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml.
Claim 47
Dependent Claim
20 words
A method according to claim 45, which further comprises subjecting to lyophilization the aqueous solution having said substance added thereto.
Claim 48
Dependent Claim
21 words
A method according to claim 45, wherein the amount of said substance is about 100 mg to 500 mg per ml.
Claim 49
Dependent Claim
20 words
A method according to claim 47, which further comprises subjecting to lyophilization the aqueous solution having said substance added thereto.
Claim 50
Dependent Claim
54 words
A stable aqueous solution or powder which contains Tumor Necrosis Factor and an effective amount of a stabilizing agent selected from a nonionic surfactant, at least one substance selected from the group consisting of D-glucose, D-galactose, D-xylose, D-glucuronic acid, a salt of D-glucuronic acid, trehalose, a dextran and a hydroxyethyl starch, and mixtures thereof.
Claim 51
Dependent Claim
54 words
A stable aqueous solution or powder which contains Tumor Necrosis Factor and an effective amount of a stabilizing agent selected from a nonionic surfactant, at least one substance selected from the group consisting of D-glucose, D-galactose, D-xylose, D-glucuronic acid, a salt of D-glucuronic acid, trehalose, a dextran and a hydroxyethyl starch, and mixtures thereof.
Claim 52
Dependent Claim
18 words
A stable aqueous solution or powder according to claim 49, wherein said stabilizing agent is a nonionic surfactant.
Claim 53
Dependent Claim
94 words
A stable aqueous solution or powder according to claim 50, wherein said nonionic surfactant is contained in an amount of about 1 μg to 1 mg per ml of the aqueous solution itself containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml, or is contained in an amount of about 1 μg to 1 mg per ml of an aqueous solution having a TNF activity of 10 2 to 10 9 units/ml which solution is one obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 54
Dependent Claim
48 words
A stable aqueous solution or powder according to claim 51, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml of the aqueous solution itself containing Tumor Necrosis Factor or an aqueous solution obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 55
Dependent Claim
22 words
A stable aqueous solution or powder according to claim 50, wherein said nonionic surfactant has an HLB value of 9 to 20.
Claim 56
Dependent Claim
94 words
A stable aqueous solution or powder according to claim 53, wherein said nonionic surfactant is contained in an amount of about 1 μg to 1 mg per ml of the aqueous solution itself containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml, or is contained in an amount of about 1 μg to 1 mg per ml of an aqueous solution having a TNF activity of 10 2 to 10 9 units/ml which solution is one obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 57
Dependent Claim
48 words
A stable aqueous solution or powder according to claim 54, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml of the aqueous solution itself containing Tumor Necrosis Factor or an aqueous solution obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 58
Dependent Claim
22 words
A stable aqueous solution or powder according to claim 50, wherein said nonionic surfactant has an HLB value of 13 to 18.
Claim 59
Dependent Claim
94 words
A stable aqueous solution or powder according to claim 56, wherein said nonionic surfactant is contained in an amount of about 1 μg to 1 mg per ml of the aqueous solution itself containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml, or is contained in an amount of about 1 μg to 1 mg per ml of an aqueous solution having a TNF activity of 10 2 to 10 9 units/ml which solution is one obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 60
Dependent Claim
48 words
A stable aqueous solution or powder according to claim 57, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml of the aqueous solution itself containing Tumor Necrosis Factor or an aqueous solution obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 61
Dependent Claim
79 words
A stable aqueous solution or powder according to claim 50, wherein said nonionic surfactant is selected from a polyoxyethylene fatty acid ester, a polyoxyethylene alkyl ether, a polyoxyethylene alkylphenyl ether, a polyoxyethylene sorbitan fatty acid ester, a polyoxyethylene glycerin fatty acid ester, a polyoxyethylene hydrogenated castor oil, a polyoxyethylene castor oil, a polyoxyethylene polyoxypropylene alkyl ether, a polyoxyethylene polyoxypropylene block polymer, a sorbitan fatty acid ester, a sucrose fatty acid ester, a glycerin fatty acid ester, and mixtures thereof.
Claim 62
Dependent Claim
94 words
A stable aqueous solution or powder according to claim 59, wherein said nonionic surfactant is contained in an amount of about 1 μg to 1 mg per ml of the aqueous solution itself containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml, or is contained in an amount of about 1 μg to 1 mg per ml of an aqueous solution having a TNF activity of 10 2 to 10 9 units/ml which solution is one obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 63
Dependent Claim
48 words
A stable aqueous solution or powder according to claim 60, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml of the aqueous solution itself containing Tumor Necrosis Factor or an aqueous solution obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 64
Dependent Claim
329 words
A stable aqueous solution or powder according to claim 50, wherein said nonionic surfactant is selected from a polyoxyethylene fatty acid ester having a saturated or unsaturated fatty acid residue with 8 to 20 carbon atoms in which the number of moles of added ethylene oxide is about 4 to 50, a polyoxyethylene alkyl ether having a saturated alkyl group with 8 to 20 carbon atoms in which the number of moles of added ethylene oxide is about 5 to 55, a polyoxyethylene alkylphenyl ether having a saturated or unsaturated alkyl group with 5 to 10 carbon atoms in which the number of moles of added ethylene oxide is about 5 to 55, a polyoxyethylene sorbitan fatty acid ester having a saturated or unsaturated fatty acid residue with 8 to 20 carbon atoms in which the number of moles of added ethylene oxide is about 5 to 50, a polyoxyethylene glycerin fatty acid ester having a saturated or unsaturated fatty acid residue with 8 to 20 carbon atoms in which the number of moles of added ethylene oxide is about 5 to 50, a polyoxyethylene hydrogenated castor oil or polyoxyethylene castor oil in which the number of moles of added ethylene oxide is about 20 to 150, a polyoxyethylene polyoxypropylene alkyl ether having a saturated or unsaturated alkyl group with 12 to 18 carbon atoms and having an ethylene oxide content of about 65 to 85% by weight, a polyoxyethylene polyoxypropylene block polymer having a number average molecular weight of about 3,000 to 15,000 and having an ethylene oxide content of about 65 to 85% by weight, a sorbitan fatty acid ester which is a mono- or sesquiacid ester of sorbitan with a saturated or unsaturated fatty acid having 8 to 20 carbon atoms, a sucrose fatty acid ester or glycerin fatty acid ester which is a mono-acid ester of sucrose or glycerin with a saturated or unsaturated fatty acid having 8 to 20 carbon atoms, and mixtures thereof.
Claim 65
Dependent Claim
94 words
A stable aqueous solution or powder according to claim 62, wherein said nonionic surfactant is contained in an amount of about 1 μg to 1 mg per ml of the aqueous solution itself containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml, or is contained in an amount of about 1 μg to 1 mg per ml of an aqueous solution having a TNF activity of 10 2 to 10 9 units/ml which solution is one obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 66
Dependent Claim
48 words
A stable aqueous solution or powder according to claim 63, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml of the aqueous solution itself containing Tumor Necrosis Factor or an aqueous solution obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 67
Dependent Claim
123 words
A stable aqueous solution or powder according to claim 62, wherein said nonionic surfactant is selected from a polyoxyethylene sorbitan fatty acid ester having a saturated or unsaturated fatty acid residue with 8 to 20 carbon atoms in which the number of moles of added ethylene oxide is about 5 to 50, a polyoxyethylene hydrogenated castor oil in which the number of moles of added ethylene oxide is about 20 to 150, a polyoxyethylene castor oil in which the number of moles of added ethylene oxide is about 20 to 150, a polyoxyethylene polyoxypropylene block polymer having a number average molecular weight of about 3,000 to 15,000 and having an ethylene oxide content of about 65 to 85% by weight, and mixtures thereof.
Claim 68
Dependent Claim
94 words
A stable aqueous solution or powder according to claim 65, wherein said nonionic surfactant is contained in an amount of about 1 μg to 1 mg per ml of the aqueous solution itself containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml, or is contained in an amount of about 1 μg to 1 mg per ml of an aqueous solution having a TNF activity of 10 2 to 10 9 units/ml which solution is one obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 69
Dependent Claim
48 words
A stable aqueous solution or powder according to claim 66, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml of the aqueous solution itself containing Tumor Necrosis Factor or an aqueous solution obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 70
Dependent Claim
52 words
A stable aqueous solution or powder according to claim 65, wherein said nonionic surfactant is selected from polyoxyethylene (20) sorbitan monooleate, polyoxyethylene (60) hydrogenated castor oil, polyoxyethylene polyoxypropylene block polymer having a number average molecular weight of about 8,350 and having an ethylene oxide content of 80% by weight, and mixtures thereof.
Claim 71
Dependent Claim
94 words
A stable aqueous solution or powder according to claim 68, wherein said nonionic surfactant is contained in an amount of about 1 μg to 1 mg per ml of the aqueous solution itself containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml, or is contained in an amount of about 1 μg to 1 mg per ml of an aqueous solution having a TNF activity of 10 2 to 10 9 units/ml which solution is one obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 72
Dependent Claim
48 words
A stable aqueous solution or powder according to claim 69, wherein the amount of said nonionic surfactant is about 5 μg to 100 μg per ml of the aqueous solution itself containing Tumor Necrosis Factor or an aqueous solution obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 73
Dependent Claim
42 words
A stable aqueous solution or powder according to claim 49, wherein said stabilizing agent is at least one substance selected from the group consisting of D-glucose, D-galactose, D-xylose, D-glucuronic acid, a salt of D-glucuronic acid, trehalose, a dextran and a hydroxyethyl starch.
Claim 74
Dependent Claim
93 words
A stable aqueous solution or powder according to claim 71, wherein said substance is contained in an amount of about 10 mg to 500 mg per ml of the aqueous solution itself containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml, or is contained in an amount of about 10 mg to 500 mg per ml of an aqueous solution having a TNF activity of 10 2 to 10 9 units/ml which solution is one obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 75
Dependent Claim
47 words
A stable aqueous solution or powder according to claim 72, wherein the amount of said substance is about 100 mg to 500 mg per ml of the aqueous solution itself containing Tumor Necrosis Factor or an aqueous solution obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 76
Dependent Claim
15 words
A stable aqueous solution or powder according to claim 71, wherein said substance is trehalose.
Claim 77
Dependent Claim
93 words
A stable aqueous solution or powder according to claim 74, wherein said substance is contained in an amount of about 10 mg to 500 mg per ml of the aqueous solution itself containing Tumor Necrosis Factor, said aqueous solution having a TNF activity of 10 2 to 10 9 units/ml, or is contained in an amount of about 10 mg to 500 mg per ml of an aqueous solution having a TNF activity of 10 2 to 10 9 units/ml which solution is one obtained by dissolving the powder containing Tumor Necrosis Factor.
Claim 78
Dependent Claim
47 words
A stable aqueous solution or powder according to claim 75, wherein the amount of said substance is about 100 mg to 500 mg per ml of the aqueous solution itself containing Tumor Necrosis Factor or an aqueous solution obtained by dissolving the powder containing Tumor Necrosis Factor.