Table I.

Characteristics of the Chromophores Present in R-Phycocyanin and R-Phycoerythrin from Gracilaria chilensis^{3, 6}

Composition	Chromophore	Cysteina	λA max	λE max
Phycoerythrin			566 nm	574 nm
α Subunit	Phycoerythrobilin	82
	Phycoerythrobilin	139
β Subunit	Phycoerythrobilin	82
	Phycoerythrobilin	158
	Phycourobilin	50–61b
Phycocyanin			621 nm	634 nm
α Subunit	Phycocyanobilin	82
β Subunit	Phycocyanobilin	84
	Phycoerythrobilin	153	540 nm

^aThe chromophores are covalently bound to cysteines at the position in the sequences shown in the table.

^bPhycourobilin is bound to Cysteines 50 and 61. Notice the erythrobilin bound to Cysteine 139 in the β subunit of Phycocyanin.