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Sterols
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Sterols are a diverse group of organic molecules that share a characteristic ring system containing three fused six-membered rings and a five-membered ring. The most common sterol in animals is cholesterol, which is found in all cell membranes. Other important sterols include ergosterol, which is found in fungi, and sitosterol, which is found in plants. Sterols are essential for the growth and development of organisms and play a variety of roles in cellular processes, including membrane fluidity, signal transduction, and hormone synthesis.
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