Reaction catalyzed by phycobiliprotein cysteine-84 phycobilin lyase (4.4.1.29)

	[phycoerythrocyanin beta-subunit]-Cys84-phycocyanobilin	=		apo-[phycoerythrocyanin beta-subunit]	+
	[phycoerythrocyanin beta-subunit]-Cys84-phycocyanobilin	=		apo-[phycoerythrocyanin beta-subunit]	+		(2R,3E)-phycocyanobilin