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The formation of the nuclear envelope in the mitosis ofSpirogyra was studied with an electron microscope. The nuclear envelope was disrupted around the spindle equator in the metaphase.
Many small vesicles were observed in the metaphase spindle. These vesicles surrounded the masses of chromosomes and nucleolar
substance in the early anaphase, and they fused with each other to form daughter nuclear envelopes during the early anaphase.
The formation of new envelopes from small vesicles at such an early mitotic anaphase is reported here for the first time.
The possible origin of these vesicles is also discussed. 相似文献
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