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There are several different types of globin chains, named alpha, beta, delta, and gamma. Normal hemoglobin types include: 1  Hemoglobin A (Hb A): makes up about 95%-98% of hemoglobin found in adults; it contains two alpha (Î±) chains and two beta (Î²) protein chains.
Hemoglobin, the protein in red blood cells responsible for ferrying oxygen from the lungs to the body's tissues (and for carrying carbon dioxide in the opposite direction), is composed of four separate amino acid polypeptide chains, or globins.ach polypeptide in hemoglobin folds to create a pocket for a heme unit, which actually carries the oxygen and carbon dioxide. Finally, the four globin chains come together due to further non-covalent interactions to produce the quaternary structure of the complete hemoglobin protein.