7 \! O; Z; a4 ]# V& P3 j+ x* u. WSperm protamine 1/protamine 2 ratios are related to in vitro fertilization pregnancy rates and predictive of fertilization ability # ~* k; I! r1 o1 rhttp://www.sciencedirect.com/sci ... i/S0015028206015020' M! Z( g% E& F6 f0 i
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Human male infertility may be due to a decrease of the protamine P2 content in sperm chromatin ' }4 l- ^* u1 n. P0 w7 W! d1 z& ^http://onlinelibrary.wiley.com/d ... 1080340109/abstract