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<p>red blood cell membrane comprises a typical <a href="page.php?w=lipid_bilayer">lipid bilayer</a>, similar to what can be found in virtually all human cells. Simply put, this lipid bilayer is composed of <a href="page.php?w=cholesterol">cholesterol</a> and <a href="page.php?w=phospholipid">phospholipid</a>s in equal proportions by weight. The lipid composition is important as it defines many physical properties such as membrane permeability and fluidity. Additionally, the activity of many membrane proteins is regulated by interactions with lipids</p><p>
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