phycobilin
Noun
Meaning
water-soluble proteinaceous pigments found in red algae and cyanobacteria
Source: WordNetHypernyms
Examples
Cryptophyte chloroplasts and some cyanobacteria don't have their phycobilin pigments organized into phycobilisomes, and keep them in their thylakoid space instead.
Rhodoplasts have chlorophyll a and phycobilins for photosynthetic pigments; the phycobilin phycoerytherin is responsible for giving many red algae their distinctive red color.