SEM of postmenopausal tissue after HRT. (A) Microvillous cells are uniformly small and polygonally shaped, covered with dense microvilli and showing apical cell protrusion. Ciliated cells (c) are numerous. Scale bar = 10 μm. (B) Fully developed uterodomes (u) were observed in most patients at biopsy D6P. Scale bar = 10 μm.