TNFalpha-IP 1 (tumor necrosis factor, alpha-induced protein 1, endothelial), also known as B12, B61, EDP1 or TNFAIP1, is a BTB/POZ domain-containing protein that belongs to the KCTD10/KCTD13/TNFAIP1 family. TNFalpha-IP 1 contains one BTB/POZ motif, which is known to mediate homomeric and heteromeric POZ-POZ interactions and is common to transcriptional regulators involved in chromatin modeling. The expression of TNFalpha-IP 1 can be induced by IL-6 and by TNFalpha in the umbilical vein of endothelial cells. TNFalpha-IP 1 may be involved in DNA repair, DNA synthesis, cell apoptosis and human diseases. TNFalpha-IP 1 is suggested to play a role in the process of cancer and in the innate immunity against the Hepatitis B virus.