Provided below are ELISA kits targeting gap junction protein beta 3, a human protein encoded by GJB3. This protein is 270 amino acids long, with a mass of 30.8 kDa, and is a member of the Connexin family, Beta-type (group I) subfamily. This is reported to be a membrane protein. There is a noted implication in Erythrokeratodermia variabilis et progressiva 1. Other alias names for this protein include: gap junction beta-3 protein, connexin 31, gap junction protein beta 3 31kDa, CX31, DFNA2B, and EKVP1.