were investigated in rat uterine epithelial cells during early pregnancy. Light microscopy and
immunohistochemical labelling were used to detect these proteins on days 1, 3, 6 and 7 of
pregnancy. Intense staining of claudin-1 at the apical region of the lateral plasma membrane
accompanied diffuse staining throughout the cytoplasm. ZO-1 was also localised in the
apical region, but ZO-1 was not present in the lower two thirds of the lateral plasma …