As cell division begins the nucleus disintegrates, the chromosomes line up in the middle of the cell and those special proteins undergo a three-dimensional sequence whereby they attach and they literally click into place end-on-end to form chains.
细胞分裂前期 细胞核分裂 染色体排列在 细胞中 那些特殊蛋白质物质 经过三维排序 从而能够 端点相连 形成链条