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求助文献一篇：
) @' C6 Y6 S$ a: P1 C& \( }Takuya Sato, Kumiko Katagiri, Tetsuhiro Yokonishi, Yoshinobu Kubota, Kimiko Inoue, Narumi Ogonuki, Shogo Matoba, Atsuo Ogura, Takehiko Ogawa  In vitro production of fertile sperm from murine spermatogonial stem cell lines. Nat Commun. 2011 ;2 :472
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