1FVP:
reference: Structure of flavoprotein FP390 from a luminescent bacterium Photobacterium phosphoreum refined at 2.7 A resolution., Kita A, Kasai S, Miyata M, Miki K, Acta Crystallogr D Biol Crystallogr. 1996 Jan 1;52(Pt 1):77-86. PMID: 15299728

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