3ESX:
reference: Flavodoxin: A compromise between efficiency and versatility in the electron transfer from Photosystem I to Ferredoxin-NADP(+) reductase., Goni G, Herguedas B, Hervas M, Peregrina JR, De la Rosa MA, Gomez-Moreno C, Navarro JA, Hermoso JA, Martinez-Julvez M, Medina M, Biochim Biophys Acta. 2008 Dec 24. PMID: 19150326

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