Clrn2 transcripts could be detected in both inner (IHCs) and outer (OHCs) hair cells of P15 wild-type mice. Otoferlin (Otof) and oncomodulin (Ocm) transcripts were used as positive controls for IHCs and OHCs, respectively. Ocm transcripts were only present in the OHC lysate, demonstrating that the IHC sample had not been contaminated with OHCs. 