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Corpus luteum histology at day 19 of gestation in wt, COX-1 KO, and COX-1 KO/OT KO mice. Luteal architecture and cell morphology in wt and COX-1 KO/OT KO mice appear similar and differ from COX-1 KO mice. (Hematoxylin/eosin-stained sections were analyzed by light microscopy at ×200 magnification.)
