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~<h5>Cholesterol is an important component of biological membranes that helps regulate membrane fluidity and is perhaps the most well&#8208;known water insoluble molecule found in cells. It is also a precursor to vitamin D and several important steroids: testosterone, estrogen, estradiol, and cortisol. Animals control their membrane fluidity with cholesterol and it is the most abundant lipid that is not a fat, oil, or phospholipid. </h5>
