1XYE:
reference: Intersubunit interactions associated with tyr42alpha stabilize the quaternary-T tetramer but are not major quaternary constraints in deoxyhemoglobin(,)., Kavanaugh JS, Rogers PH, Arnone A, Hui HL, Wierzba A, Deyoung A, Kwiatkowski LD, Noble RW, Juszczak LJ, Peterson ES, Friedman JM, Biochemistry 2005 Mar 15;44(10):3806-20. PMID: 15751957

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