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.