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自细胞内释放产物称为分泌。分泌的含义是分泌泡内可溶性物质的释放,是通过细胞排出现象(exocytosis)来完成的。近年才弄清,有些输出产物可能是从细胞脱落的细胞表面分子。“脱落”乃指细胞表面可溶性或颗粒状成份的释放,而对细胞的生活力无不良影响。“脱落”需与分泌区别。蛋白质、糖蛋白、脂蛋白、糖脂及糖氨基聚糖(glycosam-
Release of product from cells is called secretion. Secretion means the release of soluble substances in the secretory vesicles, which is accomplished by exocytosis. It has only recently become clear that some of the output products may be cell surface molecules that are shed from the cells. “Off” refers to the release of soluble or particulate components on the cell surface without adversely affecting the viability of the cell. “Off” needs to be distinguished from secretion. Protein, glycoprotein, lipoprotein, glycolipid and glycosamino-