The principal steps in the biosynthesis of steroid molecules from a common precursor, mevalonic acid, are illustrated. The successive sequences depict the formation of squalene, its polycyclization, and the intramolecular rearrangements leading to Ianosterol, a cholesterol precursor. The role of the "isoprene units" in the building of the steroid typical molecular structure is depicted, and the so-called "isoprene rule" is illustrated in this silent computer-generated videotape.
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Running time 6 minutes.
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