Fig. 2. In situ hybridizations of occludin, claudin-1 and ZO-2 mRNAs in the periimplantation mouse uterus. Dark-field photomicrographs of representative uterine sections on days 4-6 of pregnancy are shown at 40x magnifications. Am, antimesometrial side; bl, blastocyst; em, embryo; ge, glandular epithelium; le, luminal epithelium; m, mesometrial side; myo, myometrium; pdz, primary decidual zone; s, stroma; sdz, secondary decidual zone. Scale bar: 400 µm.