Connexins are membrane-spanning proteins that assemble to form gap junction channels that facilitate the transfer of ions and small molecules between cells. For a general discussion of connexin proteins, see GJB2.
In melanocytic cells GJB1 gene expression may be regulated by MITF.
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Sato H, Hagiwara H, Ohde Y et al. (2007). "Regulation of renal cell carcinoma cell proliferation, invasion and metastasis by connexin 32 gene.". J. Membr. Biol.216 (1): 17–21. doi:10.1007/s00232-007-9020-5. PMID17565422.