
Photoprotein refers to broadly to a type of protein from bioluminescent organisms. The term was first used to describe the unusual chemistry of the Chaetopterus luminescent system. This was meant to distinguish them from other light-producing proteins because these do not exhibit a luciferin-luciferase reaction, that is, a normal enzyme-substrate ...
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http://en.wikipedia.org/wiki/Photoprotein

in biochemistry, any of several proteins that give off light upon combination with oxygen, hydrogen peroxide, or other oxidizing agents. Unlike the ...
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http://www.britannica.com/eb/a-z/p/61
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