hemoglobin Bart's

hemoglobin Bart's
an abnormal hemoglobin composed of four γ chains having high oxygen affinity, seen in Southeast Asians and a few other groups; infants born with only this type of hemoglobin have hydrops fetalis and usually die within a few hours. Hemoglobin Bart's is often found mixed with hemoglobin H, resulting in α-thalassemia.

Medical dictionary. 2011.

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