Reaction catalyzed by glycoprotein-fucosylgalactoside alpha-N-acetylgalactosaminyltransferase (2.4.1.40)

		+			=			+
	UDP-N-acetyl-D-galactosamine	+		lacto-N-fucopentaose I	=		UDP	+		N-acetyl-alpha-D-galactosaminyl-1,3-[lacto-N-fucopentaose I]