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pressure. Fetal hemoglobin is a variant containing two gamma subunits instead of two beta subunits. Fetal hemoglobin is the predominant form up until the infant is several months old, and it has a greater oxygen affinity to compensate for the low oxygen tension of supplied maternal blood during pregnancy. Hemoglobin has a lower oxygen affinity at low pH. This allows for rapid dissociation as oxygenated hemoglobin is transported to cells throughout the body. Because of the CO₂ production and aqueous formation of carbonic acid in respiring

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