phycourobilin-L-cysteinyl(84)-[R-phycocyanin alpha-subunit] = apo-L-cysteinyl(84)-[R-phycocyanin alpha-subunit] + (2R,3E)-phycoerythrobilin
phycourobilin-l-cysteinyl(84)-[r-phycocyanin alpha-subunit] = apo-l-cysteinyl(84)-[r-phycocyanin alpha-subunit] + (2r,3e)-phycoerythrobilin
phycourobilin-L-cysteinyl(84)-[R-phycocyanin alpha-subunit] = apo-L-cysteinyl(84)-[R-phycocyanin alpha-subunit] + (2R,3E)-phycoerythrobilin
phycourobilin-l-cysteinyl(84)-[r-phycocyanin alpha-subunit] = apo-l-cysteinyl(84)-[r-phycocyanin alpha-subunit] + (2r,3e)-phycoerythrobilin