求助文献两篇

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" Y$ G) K' ^' t篇名：Spermatogonial stem cell preservation and transplantation: from research to clinic.
0 o. u9 i5 c6 |6 I# {作者：Goossens E, Van Saen D, Tournaye H.  }3 O6 t$ A& G+ B+ I5 G7 k$ h
期刊：Hum Reprod. 2013 Feb 20- S0 e4 U' o6 Y0 f; V% V, Y, \5 j# F
链接：http://www.ncbi.nlm.nih.gov/pubmed/234272285 k( I# o0 G  d9 j! K) u: p" q
         http://humrep.oxfordjournals.org ... g&pmid=23427228
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  d9 z% R$ X* c8 b( o篇名：GABA exists as a negative regulator of cell proliferation in spermaogonial stem cells- r2 [+ J4 B0 C" q: v0 M1 q* ?
作者：Yong Du, Zhao Du, Hongping Zheng, Dan Wang, Shifeng Li, Yuanchang Yan, Yiping Li , ]" c: b1 C8 s. X
期刊：Cellular & Molecular Biology Letters  February 2013
5 f% M3 V1 m2 P3 J$ w链接：http://link.springer.com/article/10.2478%2Fs11658-013-0081-4#