Sialyl Tn antigens Tn antigens Sialyltransferase I can add sialic acid to the Tn antigen at the alpha 6 position Authored: Jassal, B, 2010-10-15 Beta-galactoside alpha-2,6-sialyltransferase 1 (ST6GAL1) transfers a sialic acid from the donor CMP-sialic acid to galactose-containing acceptor substrates such as the Tn antigen (Stamenkovic et al, 1990). EC Number: 2.4.99.1 Edited: Jassal, B, 2010-10-15 Pubmed2373995 Reactome Database ID Release 43977071 Reactome, http://www.reactome.org ReactomeREACT_115991 Reviewed: Ferrer, A, 2011-11-04