Secretory activity of the uterus epithelial cells.

<p>Transverse section through the infolding of the uterus wall (boxed fragment of <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0064087#pone-0064087-g001" target="_blank">Figure 1C</a>). Two closely opposed epithelial layers are visible. Note argyrophylic secretory vacuoles in the cytoplasm of epithelial cells (encircled). Basement lamina (empty arrows), tracheal branches (black arrowheads), argyrophylic material on the cell surface (white asterisks). Semi-thin section stained with AgNOR technique. LM, scale bar: 24 µm.