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A carrier of hemoglobin Chesapeake, born of a normal mother, had a cord-blood hematocrit of 60%. The oxygen affinity of his blood was increased. Hemoglobin F-Chesapeake (alpha 2 Ches gamma 2), partially purified from the infant's blood, had oxygen affinity greater than that of hemoglobin A, but less than that of the adult form of the abnormal hemoglobin (alpha 2 Ches beta 2). These findings suggest that the conformation of that part of the gamma chain which contacts the site of amino acid substitution in Hb F-Chesapeake is similar to the analogous region of hemoglobin F. They also support the hypothesis that regulation of erythropoiesis in late fetal life is similar to that of the adult, and is under fetal control.

The Effect of Hemoglobin F-Chesapeake (α292 Arg. → Leuγ2) on Fetal Oxygen Affinity and Erythropoiesis