Fatty Acid Oxidation
Lipid Biosynthesis
The first recognizable steroid ring system is
lanosterol; it is formed first by the epoxidation of the double bond of squalene that was originally derived from a DMAPP through farnesyl pyrophosphate, and then by the cyclization of squalene epoxide. The enzyme that forms the epoxide uses NADPH to reduce molecular oxygen to make the epoxide. See Figure
1 .
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