2G18:
reference: Insight into the radical mechanism of phycocyanobilin-ferredoxin oxidoreductase (PcyA) revealed by X-ray crystallography and biochemical measurements., Tu SL, Rockwell NC, Lagarias JC, Fisher AJ, Biochemistry. 2007 Feb 13;46(6):1484-94. Epub 2007 Jan 17. PMID: 17279614

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