... nuclear sap 核液 nuclear spindle 核纺锤体 nuclease 核酸酶 ...
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Under electron microscope, it was found that in some cells the nuclear membrane disappeared partly, chromatin became broadly granular and two centrioles were jointed by spindle fibers.
在透射电镜下观察到有细胞核膜消失，染色质变成粗颗粒状．中心粒一分为二，两中心粒之间还有纺锤丝牵引；
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