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Sterols are a subgroup of steroids with hydroxyl groups at the 3-position of the A-ring. They play essential roles in cell membrane structure and function.
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Cholesterol: A type of sterol found predominantly in animal cell membranes that helps maintain membrane fluidity.
Ergosterol: A sterol present in fungal cell membranes that serves functions similar to cholesterol.
Hopanoids: Lipid molecules in some bacteria that function similarly to sterols by stabilizing the cell membrane.