Immunolocalization of SERPINE2 in the uterus during lactation. Uterine sections were immunostained as described in Figure 2. The uterus on postnatal day 1 stained with control antiserum is shown (A). Uteri on postnatal days 1 (B), 2 (C), and 14 (D) were stained with anti-SERPINE2 antiserum. Bar = 500 μm. cm, circular muscle; ge, glandular epithelium; le, luminal epithelium; lm, longitudinal muscle.