Sialyl-2,3 T antigens Disialyl T antigens ST6GALNAC3/4 can add a sialic acid to the sialyl T antigen to form the disialyl T antigen Authored: Jassal, B, 2010-10-15 EC Number: 2.4.99.7 Edited: Jassal, B, 2010-10-15 Pubmed11062056 Reactome Database ID Release 43981809 Reactome, http://www.reactome.org ReactomeREACT_115974 Reviewed: Ferrer, A, 2011-11-04 The human genes ST6GALNAC3 and 4 encode GalNAc alpha-2,6-sialyltransferase III and IV respectively which can add a sialic acid residue to sialyl T antigen to produce a disialyl T antigen. ST6GALNAC4 is characterised (Harduin-Lepers et al, 2000) while ST6GALNAC3 is thought to perform a similar function based on sequence similarity.