Fig. 3.

AQP immunoperoxidase labelling of non-malignant prostatic tissues (BPH). Intense expression of AQP 3 throughout the epithelium from a patient with BPH. Labelling was most intense in the basal layer, less intense in the intermediate layer and weak in the luminal cells (a). At higher magnification, a distinct localisation pattern was apparent, with intense labelling of intercellular borders in the basal and suprabasal compartments (b). No immunoreactivity was seen in the submucosa, smooth muscle or endothelium. No expression of AQP 4 was detected (c). Heterogeneous expression of AQP 5 (d), diffuse expression of AQP 7 (e) and weak expression of AQP 9 (f) was observed