3RGB:
reference: Crystal Structure and Characterization of Particulate Methane Monooxygenase from Methylocystis species Strain M., Smith SM, Rawat S, Telser J, Hoffman BM, Stemmler TL, Rosenzweig AC, Biochemistry. 2011 Nov 29;50(47):10231-40. Epub 2011 Nov 3. PMID: 22013879

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