Fig. 5

Glycogen detected by PAS/PAS-D staining. a Non-pregnant: no detectable glycogen in the endometrium b Early-gestation: intense glycogen staining in the luminal and glandular epithelia. c Mid-gestation; endometrial arcade: strong glycogen staining in the glandular epithelium and mild staining in the stroma. Tr = trophoblast, IVS = intervillous space