在次级精母细胞时期，胞质内出现致密的前顶体颗粒；

At the stage of secondary spermatocyte, electron densed proacrosomal granules were found in the cell.

youdao

在次级精母细胞时期，胞质内出现致密的前顶体颗粒；

At the stage of secondary spermatocyte, electron densed proacrosomal granules were found in the cell.

youdao