求文献，有题目有连接

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题目：Glial cell line-derived neutrotrophic factor and neurturin can act as paracrine growth factors stimulating DNA synthesis of Ret-expressing spermatogonia.! j7 J0 t* I/ O6 X+ K/ l4 Y
http://www.spandidos-publications.com/ijo/16/4/689
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