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PR domain zinc finger protein 12 is a protein that in humans is encoded by the PRDM12 gene. This gene is normally switched on during the development of pain-sensing nerve cells. People with homozygous mutations of the PRDM12 gene experience congenital insensitivity to pain (CIP).[5][6] PRMD12 is a part of a larger domain that mediate histone methyltransferases. Enzymes target gene promoters in order to control gene expression.[7]