The Interesting research about penis

热度 1 简建波 2013-6-9 10:30

1、How the chicken lost its penis http://www.nature.com/news/how-the-chicken-lost-its-penis-1.13152 The case of the missing bird penis is a longstanding mystery in evolutionary biology. But the identification of a molecular mechanism that controls penis loss in birds goes some way to sol ...

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