Fig. 1From: Cytochrome P450 oxidoreductase deficiency caused by R457H mutation in POR gene in Chinese: case report and literature reviewPOR involvement in various biological pathways. POR donates electrons to all P450 enzymes, and at the same time, provides electrons for some proteins and small molecules, which involved in numerous biological activities such as biosynthesis, cholesterol metabolism, sex hormone metabolism and the metabolism of drugs and toxinsBack to article page