1FCD:
reference: The structure of flavocytochrome c sulfide dehydrogenase from a purple phototrophic bacterium., Chen ZW, Koh M, Van Driessche G, Van Beeumen JJ, Bartsch RG, Meyer TE, Cusanovich MA, Mathews FS, Science 1994 Oct 21;266(5184):430-2. PMID: 7939681

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