nelja tsüklilist steroidset struktuuri sisaldav lipiid, mille üks tsükkel on seotud hüdroksüülrühmaga
A sterol, is biosynthesized by all animal cells, because it is an essential structural component of all animal cell membranes; essential to maintain both membrane structural integrity and fluidity and a base for the synthesis of vitamin D and steroid hormones.
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Teda leidub palju eukarüootide membraanides ning temast sünteesitakse steroidhormoone, sapihappeid ja vitamiin D.
