Sterol-C4-methyloxidase-like/methylsterol monooxygenase 1 (SC4MOL, DESP4, ERG25, MSMO1) is an endoplasmic reticulum enzyme that catalyzes the demethylation of C4-methlysterols (meiosis-activating sterols, MAS) in the cholesterol synthesis pathway. Defective/mutated SC4MOL contributes to psoriasiform...