Fig. 6From: Gene expression dynamics during the gonocyte to spermatogonia transition and spermatogenesis in the domestic yakCXCR4 was expressed in gonocytes and a subpopulation of spermatogonia in yak. a-b Immunostaining for CXCR4 in testicular sections from 3, 5, and 24 months old yaks. Black arrowheads indicate CXCR4 positive cells. c Negative control of each time point. Scale bars represent 50 μmBack to article page