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On the cover: Immunofluorescence labeling of mouse cortical collecting duct for the vasopressin V1a receptor (V1aR; green signal). Principal cells were identified by concomitant labeling of aquaporin 2 (AQP2; magenta signal) and type B intercalated cells were identified by co-staining for pendrin (red signal). V1aR is present in the basolateral membrane of AQP2- and pendrin-negative type A intercalated cells, whereas pendrin-positive type B intercalated cells show a subapical V1aR signal; nuclear counterstaining with DAPI (blue). Torsten Giesecke et al., Charité – Universitätsmedizin Berlin and Berlin Institute of Health, Germany