The function of EXTL2 (exostosin like glycosyltransferase 2, Ensembl gene identifier ENSG00000162694) is as follows. Glycosyltransferase required for the biosynthesis of heparan- sulfate and responsible for the alternating addition of beta-1-4-linked glucuronic acid (GlcA) and alpha-1-4-linked N-acetylglucosamine (GlcNAc) units to nascent heparan sulfate chains. .