2D1E:
reference: From the Cover: Crystal structure of phycocyanobilin:ferredoxin oxidoreductase in complex with biliverdin IX{alpha}, a key enzyme in the biosynthesis of phycocyanobilin., Hagiwara Y, Sugishima M, Takahashi Y, Fukuyama K, Proc Natl Acad Sci U S A. 2006 Jan 3;103(1):27-32. Epub 2005 Dec 27. PMID: 16380422

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