GJB2 and deafness: In addition, hundreds of mutations associated with human deafness have been identified in Cxs other than GJB2, such as GJB6 (encoding Cx30; Grifa et al., 1999), GJB3 (encoding Cx31; Xia et al., 1998; López-Bigas et al., 2001), GJE1 (encoding Cx29; Yang et al., 2007), and GJB1 (encoding Cx32; Rabionet et al., 2000, 1).