Fig. 1. Coincident redistribution of KCNQ4 and prestin in rat OHCs. (A) Immunohistochemistry shows KCNQ4 (green) and prestin (red) in OHCs before (P8) and at onset of hearing (P12). (B) Double immunohistochemistry of prestin (red) and KCNQ4 (green) in a mature (P21) OHC. Arrows, KCNQ4 and prestin protein; arrowheads, basal pole of OHCs. Bars, 20 µm.