Acrosomal protein NEP4 is required for sperm retention in, but not entry into, the female seminal receptacle in Drosophila melanogaster.

The reduction during 1 to 24 h was more extensive for Nep4 sperm than normal sperm; indeed, a highly significant interaction factor was found between males and time points ( Fig. 8 ; F = 102.4, d.f. = (1, 66), P < 0.0001).

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