CTR9, parafibromin (CDC73\; MIM 607393), LEO1 (MIM 610507), and PAF1 (MIM 610506) form the PAF protein complex, which associates with the RNA polymerase II subunit POLR2A (MIM 180660) and with a histone methyltransferase complex (Rozenblatt-Rosen et al., 2005 [PubMed 15632063]).[supplied by OMIM, Mar 2008].