1ITH:
reference: Structure determination and refinement of homotetrameric hemoglobin from Urechis caupo at 2.5 A resolution., Kolatkar PR, Ernst SR, Hackert ML, Ogata CM, Hendrickson WA, Merritt EA, Phizackerley RP, Acta Crystallogr B 1992 Apr 1;48 ( Pt 2):191-9. PMID: 1515107

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