Figure 2. High-power light micrograph of the efferent ducts of a normal adult animal immunostained with anti—aquaporin-1 (anti—AQP-1) antibody. The microvilli of the nonciliated cells (NC) show a homogeneous thick band of reaction product (arrowheads). Also reactive are the tall cilia of the ciliated cells (short arrows) stretching into the lumen, the basolateral plasma membranes (long arrows) between adjacent epithelial cells, and the membranes delimiting large apical endocytic vesicles (circles) of the nonciliated cells. Lu indicates lumen; n, nuclei of nonciliated cells. 1048x.