24-dehydrocholesterol reductase MEPAVSLAVC ALLFLLWVRL KGLEFVLIHQ RWVFVCLFLL PLSLIFDIYY YVRAWVVFKL SSAPRLHEQR VRDIQKQVRE WKEQGSKTFM CTGRPGWLTV SLRVGKYKKT HKNIMINLMD ILEVDTKKQF RIL