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。
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.
浓缩铀uo_2f_2可诱发精原细胞和初级精母细胞的染色体畸变。
Enriched UO2F2 could result in chromosomal aberrations in spermatogonia and primary spermatocytes.
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