Dictionary of Human Evolution and Biology

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Embryonic Hemoglobin

Umbrella term for several forms of hemoglobin synthesized in the embryonic yolk sac during the first 12 weeks of human gestation, the most common form of which consists of two alpha globin chains and two epsilon globin chains. Embryonic hemoglobin has a 30% higher affinity for oxygen than does adult hemoglobin.

See fetal hemoglobin.

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