2ZXK:
reference: Crystal Structure of Red Chlorophyll Catabolite Reductase: Enlargement of the Ferredoxin-Dependent Bilin Reductase Family., Sugishima M, Kitamori Y, Noguchi M, Kohchi T, Fukuyama K, J Mol Biol. 2009 Apr 15. PMID: 19374909

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