3d image of zymosterol skeletal formula

zymosterol intermediate cholesterol biosynthesis lanosterol endoplasmic reticulum cytosol phosphatidylcholine pc lecithin sphingomyelin phosphatidylethanolamine phospholipid membrane choline cell arachidonic acid lipid phosphocholine fatty ceramide lysophosphatidylcholine bilayer surfactant glycerophospholipid phosphatidylserine lipophilic metabolite metabolism cycle mechanism pathway path catabolism biosynthetic biogenesis substrate precursor synthesis derivative bioprecursor metabolic enzyme endogenous contractor 3d