2.4.1.38	beta-N-acetylglucosaminylglycopeptide beta-1,4-galactosyltransferase	i antigen and I antigen biosynthesis	
2.4.1.149	N-acetyllactosaminide beta-1,3-N-acetylglucosaminyltransferase	i antigen and I antigen biosynthesis	
2.4.1.150	N-acetyllactosaminide beta-1,6-N-acetylglucosaminyltransferase	i antigen and I antigen biosynthesis	
2.4.1.386	GlcNAc-beta-1,3-Gal beta-1,6-N-acetylglucosaminyltransferase (distally acting)	i antigen and I antigen biosynthesis