Nnmt is a symbol for the gene, Nicotinamide N-methyltransferase, in humans. Other names include: Nicotinamide N-methyltransferase . The encoded protein is an enzyme with an amino acid length of 264 and a mass of 29.6 kDa. Nnmt is a member of the Class I-like SAM-binding methyltransferase superfamily, NNMT/PNMT/TEMT family. This gene shares homology with other species, including: Mouse, Rat, Frog.