RBP2 belongs to a family of demethylases, specific for tri-and dimethylated lysine 4 on histone 3.
Christensen J, Agger K, Cloos PA, Pasini D, Rose S, Sennels L, Rappsilber J, Hansen KH, Salcini AE, Helin K. Cell. 2007 Mar 23; 128(6):1063-76. Epub 2007 Feb 22.