Absence of spermatozoa in the caput epididymis of adult <i>Slc9a3</i>^<i>-/-</i> mice.

<p>Histological pathology of the caput epididymis of 6-month-old WT (A, B) and 2- (C, D), 4- (E, F), and 6-month-old (G, H) <i>Slc9a3</i>^<i>-/-</i> mice was assessed by H&E staining. (A, C, E, G) Each montage, which contains a series of images obtained with a ×10 objective, displays the general morphology of the caput epididymis section. (B, D, F, H) Enlarged view is marked by a black dashed line in the upper panel. Spermatozoa are marked by arrowheads. Abnormal secretions (arrow) observed in the ducts of the caput epididymis of <i>Slc9a3</i>^<i>-/-</i> male mice. Scale bar = 200 μm (A, C, E, G) and 20 μm (B, D, F, H).