GJB2 and hearing loss disorder: Another example of hearing loss where multiple cell types may be affected includes Connexin 26 and 30 encoded by Gjb2 and Gjb6, respectively, which appear to be expressed in intermediate and basal cells and, to a lesser extent, marginal cells (Figure 10) (Lang et al., 2007; Nickel and Forge, 2008; Liu et al., 2009; Mei et al., 2017).