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and 4,4-dimethyl sterols, respectively.
* Side chain presence on C-24. Examples include 24-desmethyl (e.g. cholesterol), 24-methyl (e.g. campesterol), and 24-ethyl (e.g. stigmasterol or ?-sitosterol).
* Unsaturation of sterol. Double bonds are common at the 5,6-position (termed ?5 sterols, e.g. cholesterol), the 7,8-position (termed ?7 sterols, e.g. lathosterol), or both (termed ?5,7 sterols, e.g. ergosterol and 7-dehydrocholesterol).