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. Author manuscript; available in PMC: 2009 Jun 1.
Published in final edited form as: Reproduction. 2008 May 30;136(6):691–701. doi: 10.1530/REP-08-0096

FIG 1.

FIG 1

Photomicrographs of LBNF1 rat testes showing the radiation-induced block in the differentiation of spermatogonia (A & B) and the reversal of this block by GnRH-antagonist treatment. The testes were harvested 13 weeks after 5 Gy irradiation with or without GnRH antagonist treatment during wks 3 to 7 after irradiation. Note that with no GnRH antagonist treatment all tubules are atrophic (X) and contain only Sertoli cells and type A spermatogonia (A), with normal (filled arrow) and dividing (open arrow) spermatogonia shown at higher magnification (B). With GnRH antagonist treatment all tubules are repopulating (*) with mature spermatids in many of them (Sp) (C). Bars = 50 μm (A and C) and 20 μm (B).