phycoerythrobilin-L-cysteinyl(84)-[C-phycoerythrin alpha-subunit] <=> apo-L-cysteinyl(84)-[C-phycoerythrin alpha-subunit] + (2R,3E)-phycoerythrobilin
phycoerythrobilin-l-cysteinyl(84)-[c-phycoerythrin alpha-subunit] <=> apo-l-cysteinyl(84)-[c-phycoerythrin alpha-subunit] + (2r,3e)-phycoerythrobilin