PRMT3 encodes the human gene, Protein arginine methyltransferase 3. It may also be known as: Protein arginine N-methyltransferase 3; Heterogeneous nuclear ribonucleoprotein methyltransferase-like protein 3; Protein arginine N-methyltransferase 3 ; HRMT1L3. The encoded protein is an enzyme with an amino acid length of 531 and a mass of 59.9 kDa. Other isoforms may exist. PRMT3 is a member of the Class I-like SAM-binding methyltransferase superfamily, Protein arginine N-methyltransferase family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Arabidopsis, Zebrafish, Frog, Chicken.