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GO:0000254: C-4 methylsterol oxidase activity (Molecular function)

"Catalysis of the reaction: 4,4-dimethyl-5-alpha-cholesta-8,24-dien-3-beta-ol + 6 Fe(II)-[cytochrome b5] + 5 H+ + 3 O2 = 4-beta-hydroxymethyl-4-alpha-methyl-5-alpha-cholesta-8,24-dien-3-beta-ol + 6 Fe(III)-[cytochrome b5] + 4 H2O." [PMID:9811880, RHEA:55220]

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