核固缩（pyknosis），表现为核缩小、凝聚，呈深蓝染，提示DNA停止转录。
透射电镜下可见凋亡细胞的核固缩或凋亡小体。
Nuclear condensation or apoptotic body in the apoptotic cells were observed under transmission electron microscope.
结果：与对照组相比，各氯化铝组均可见海马CA 1区细胞层变薄伴明显核固缩。
RESULTS: The layer of CA1 pyramidal cells in both AO groups became thinner with pyknotic nuclei than control.
倒置显微镜下可观察到部分凋亡细胞出现染色质凝集、核固缩、核碎裂等形态学改变。
Morphological changes including chromatic agglutination, karyopyknosis, and nuclear fragmentation could be observed in some of the cells under inverted microscope.
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