Zymosterol is an intermediate in cholesterol biosynthesis.

[1] Disregarding some intermediate compounds (e.g. 4-4-dimethylzymosterol), lanosterol can be considered a precursor of zymosterol in the cholesterol synthesis pathway.

The conversion of zymosterol into cholesterol happens in the endoplasmic reticulum.

Zymosterol accumulates quickly in the plasma membrane coming from the cytosol.

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