... University, Hiroshima, Japan;4PHP Laboratory for Molecular Biology, Sendai, JapanWhen the a and b chains were separated from human oxyhemoglobin (HbO2), each individual chain was o xidizedeasily ... Shikama, PHP Laboratory for MolecularBiology, Nakayama-Yoshinari 1-16-8, Sendai 989±3203, Japan.Fax: + 81 22 278 6180, E-mail: shikama@mail.cc.tohoku.ac.jpAbbreviations: p-MB, sodium p-hydroxymercuribenzoate.(Received ... chains [8]. In the autoxidation reaction of HbO2,aswellasMbO2,pH can affect the rate in many d ifferent ways. Recent kineticand thermodynamic studies of the stability of mammalianoxymyoglobins...