2XYK:
reference: Structural characterization of a group II 2/2 hemoglobin from the plant pathogen Agrobacterium tumefaciens., Pesce A, Nardini M, Labarre M, Richard C, Wittenberg JB, Wittenberg BA, Guertin M, Bolognesi M, Biochim Biophys Acta. 2010 Nov 9. PMID: 21070893

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