The inset panels in A and B are a magnified view showing that normal testicular cords were present in both Wt1+/+; Sf1+/+ and Wt1+/???; Sf1+/??? B6 XYB6 fetuses (white dotted line outlines a section of a single cord). (C???J) WIHC analysis of E13.5 B6 XYB6 gonad/mesonephros complexes stained with SOX9 (Sertoli cells, green) and PECAM (germ cells and vascular endothelial cells, red).