text: Beta-1,4-galactosyltransferase I (beta4Gal-T1) normally transfers Gal from << UDP-Gal >> to GlcNAc in the presence of Mn(2+) ion ([[ Gal-T ]] activity) and also transfers Glc from UDP-Glc to GlcNAc (Glc-T activity), albeit at only 0.3% efficiency.