Hemoglobin A
Encyclopedia
Hemoglobin A or adult hemoglobin is the most common human hemoglobin
Hemoglobin
Hemoglobin is the iron-containing oxygen-transport metalloprotein in the red blood cells of all vertebrates, with the exception of the fish family Channichthyidae, as well as the tissues of some invertebrates...

tetramer, comprising over 97% of the total red cell hemoglobin. It consists of two alpha chains and two beta chains (a2b2).
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