细胞外基质（extracellularmetrix，ECM）包括胶原蛋白（collagen）、弹力蛋白（elastin）、蛋白多糖（proteoglycan）类如透明质酸、硫酸软骨素、肝素等，以及ECM糖蛋白如基膜粘连蛋白（laminin）。
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