2HHE:
reference: Chloride ion independence of the Bohr effect in a mutant human hemoglobin beta (V1M+H2deleted)., Fronticelli C, Pechik I, Brinigar WS, Kowalczyk J, Gilliland GL, J Biol Chem. 1994 Sep 30;269(39):23965-9. PMID: 7929044

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