A general term for any steroid compound found naturally in living organisms, particularly in cell membranes and tissues.
From 'bio-' (life) + 'steroid' (type of organic compound with a four-ring structure). The '-in' suffix indicates it's a specific biological compound, similar to 'keratin' or 'elastin'.
Biosterins like cholesterol get a bad reputation, but they're absolutely essential—your cell membranes wouldn't work without them, and your hormones are made from them. It's an example of how 'bad' and 'good' are oversimplifications in biology!
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