Reaction catalyzed by mannuronate-specific alginate lyase (4.2.2.3)

		=		4-deoxy-alpha-L-erythro-hex-4-enuronosyl-beta-1,4-oligo-D-mannuronate	+
	poly-beta1,4-D-mannuronic acid	=		4-deoxy-alpha-L-erythro-hex-4-enuronosyl-beta-1,4-oligo-D-mannuronate	+		D-mannuronate