KMT1B is an alias for the gene, Suppressor of variegation 3-9 homolog 2, in humans. Other names include: Histone-lysine N-methyltransferase SUV39H2; H3-K9-HMTase 2; Lysine N-methyltransferase 1B; Su(var)3-9 homolog 2; Histone H3-K9 methyltransferase 2; Histone-lysine N-methyltransferase SUV39H2 ; suppressor of variegation 3-9 homolog 2 (Drosophila). The encoded protein is an enzyme with an amino acid length of 410 and a mass of 46.7 kDa. KMT1B is a member of the Class V-like SAM-binding methyltransferase superfamily, Histone-lysine methyltransferase family, Suvar3-9 subfamily. This gene shares homology with other species, including: Mouse, Rat, Frog, Chicken.