KCNQ4 and hearing loss disorder: As Kv7.4 is most abundantly expressed in OHCs in the inner ear, and OHC dysfunction and subsequent loss are believed to be the primary cause of DFNA2 hearing loss, we repeated the CellTox Green Cytotoxicity assay for Kv7.4WT, Kv7.4Q71fs, Kv7.4W242X, Kv7.4A349fs and prestinWT in an HEI-OC1 cell line that was derived from murine inner ear (Kalinec et al., 2003).