Reaction catalyzed by D-threonine aldolase (4.1.2.42)

		+			=			+
	glycine	+		4-methylbenzaldehyde	=		(2R,3S)-2-amino-3-hydroxy-3-(4-methylphenyl)propanoic acid	+		(2R,3R)-2-amino-3-hydroxy-3-(4-nitrophenyl)propanoic acid