Dand E.24h,shrinkage of nuclei with karyorrhexis(arrow)and pyknosis.

D和E.24小时,细胞核皱缩有核(头)和固缩。

The senescent chondrocytes were distributed in the central zone whereapoptotic morphological characteristics obviously appeared, such as pyknosis, karyorrhexis.

气软骨中央带老的软骨细胞，并明显核固缩、核等细胞凋亡形态学特征。