An endogenous nuclease in hamster, mouse, and human spermatozoa cleaves DNA into loop-sized fragments.
Sotolongo B, Huang TT, Isenberger E, Ward WS. An endogenous nuclease in hamster, mouse, and human spermatozoa cleaves DNA into loop-sized fragments. J Androl. 2005 Mar-Apr; 26(2):272-80.