Phycoerythrobilin

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What Wikipedia says

Phycoerythrobilin is a red phycobilin, i.e. an open tetrapyrrole chromophore found in cyanobacteria and in the chloroplasts of red algae, glaucophytes and some cryptomonads. Phycoerythrobilin is present in the phycobiliprotein phycoerythrin, of which it is the terminal acceptor of energy.

Excerpt from the Wikipedia article “Phycoerythrobilin”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Fvasconcellos 13:25, 13 June 2007 (UTC), Public domain, via Wikimedia Commons.