4KX6:
reference: Plasticity of the Quinone-Binding Site of the Complex II Homolog Quinol:Fumarate Reductase., Singh PK, Sarwar M, Maklashina E, Kotlyar V, Rajagukguk S, Tomasiak TM, Cecchini G, Iverson TM, J Biol Chem. 2013 Jul 8. PMID: 23836905

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