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.