beta ( 1-4 ) -galactosyltransferase from human milk ( the a protein of lactose synthase ) has been found to be heterogeneous when fractionated by affinity chromatography against insolubilized alpha-lactalbumin , using a linear gradient of decreasing n-acetylglucosamine concentration .
C0016964
galactosyltransferase
C0022952
lactose