Cover: The cover figure shows an XX Wnt4−/− gonad cultured for 24 hours in control media. Immunostaining for PECAM1 (red) to mark germ cells (round cells) and endothelial cells highlights the ectopic male-specific vasculature that forms along the coelomic surface in these mutants. Dapi staining marks nuclei (blue). Tissue is oriented with the coelomic surface of the gonad at the top, and the mesonephros at the bottom. See D.M. Maatouk et al., pp. 2949-2955.
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