The Phycobilin reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Phycobilin

Any of a group of water-soluble proteinaceous pigments that occur in red algae and cyanobacteria. Especially good at absobing blue light, enabling those organisms which contain them to grow at deeper depths in the water. Red algae, for example, can grow at depths of up to 260 meters.

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