人类21三体综合征的成因是在生殖细胞形成的过程中第21号染色体没有分离通常是减数第一次分裂期的不分离造成的已知21四体的胚胎不能成活 Template




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tomski人类21三体综合征的成因是在生殖细胞形成的过程中第21号染色体没有分离通常是减数第一次分裂期的不分离造成的已知21四体的胚胎不能成活 coloring