The first stage of mitosis, during which the chromosomes condense and become visible, the nuclear membrane breaks down, and the spindle apparatus forms at opposite poles of the cell.
前期阶细胞减数分裂的第一个阶段，其间染色体浓缩且能被看见，核细胞膜衰弱。
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；
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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