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

D和E.24小,核皱缩有核碎裂(箭头)和固缩。

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

气软骨中央带多衰老的软骨，明显核固缩、核碎裂等凋亡形态学特征。