In situ hybridization for arginase, Tnfrsf9, and Tnni2 in the non-gravid and gravid d13.5 wild-type and Cox-1 KO mouse uteri. In situ hybridization was performed on (n = 4) each gravid time point and (n = 2) non-gravid mice. Shown are representative light-field images (left) and dark-field images (right) from non-gravid (NG) (50×) or gravid d13.5 uteri (25×). The slides were counterstained with hematoxylin and eosin. Areas of hybridization appear white, demonstrating deposition of silver granules.