( 2 ) the mortality of cp cell in 10 were increasing directly related with the time in the low temperature . after 120d some cp cells died in the way of apoptosis . most nucleus of cells were condensed , and chromosome was marginated beside the nucleus inner membrane , cell sizes were reduced , dna ladder showed in dna gel electrophoresis ( 2 ) cp细胞系在10低温下细胞死亡率与时间成正比， 120d的细胞具典型的凋亡现象，即细胞核固缩、染色体边集在核膜内侧；细胞体积变小；琼脂糖凝胶电泳上显示特征性的“梯状”带。
