GC-R labeling (A-D) was observed in or at the plasma membrane of OHCs (B, arrows), Hensen cells (C, arrows) and pillar cells (D, arrows). MC-R labeling (E-H) in or near the plasma membrane of OHCs (F and G, arrows) and pillar cells (H, arrows). Both receptors colocalized with the membrane dye CellMask (CM), shown in red in panels A-D, E, F and H. Panel G shows colocalization of MC-R with the plasma membrane marker β-catenin (red).