Sensory hair cell bundle patterning and measurements in clarinet mice Pseudo-coloured scanning electron micrographs of individual OHC (left panels) and IHC (right panels) hair bundles from clarinet mice at P28. Clrn2clarinet/clarinet mutants have only two rows of OHC stereocilia, and the middle row of stereocilia is less uniform in height compared to controls. The middle and short rows of stereocilia in Clrn2clarinet/clarinet IHC bundles appear fewer in number, and heterogeneous in height. Scale - 2 µm. 