5OWG:
reference: Evolution and molecular mechanism of four-electron reducing ferredoxin-dependent bilin reductases from oceanic phages., Ledermann B, Schwan M, Sommerkamp JA, Hofmann E, Beja O, Frankenberg-Dinkel N, FEBS J. 2017 Nov 20. doi: 10.1111/febs.14341. PMID: 29156487

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