Immunohistochemistry analysis of BCL11B (A) and RORC (B) proteins in the endometrium on Days 12 and 15 of the estrous cycle and pregnancy in pigs. Representative uterine sections from Day 15 of pregnancy immunostained with normal IgG (IgG) are shown as negative controls, and tissue sections from the duodenum for BCL11B and small intestine for RORC serve as a positive control, respectively. D, Day; C, estrous cycle; P, pregnancy; LE, luminal epithelium; GE, glandular epithelium. Bars = 100 µm, 20 µm in inset.