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编程性细胞死亡是指由基因编码决定的生理性、主动性细胞死亡，具有特定的时空顺序和形态学特征，在胚胎形成、动物的变态过程中有重要意义，是一种进化的表现
Apoptosis is a kind of physiological and active cell death which is determined by gene coding. It has certain spatiotemporal order and morphological characteristics. It is of great significance in embryogenesis and animal metamorphosis and is an evolutionary manifestation