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

D和E.24小时,细胞核皱缩有核碎裂(箭头)和固缩。

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

气管软骨中央带多见衰老的软骨细胞，并见明显核固缩、核碎裂等细胞凋亡形态学特征。