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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.
At its simplest level, hemoglobin is made up of amino acids stuck together in chains. These chains are polypeptides that are also stuck to a heme molecule, which is where the oxygen will eventually stick. Hemoglobin is different than other proteins because its individual polypeptides, of which there are four, are called globins instead of simply protein subunits.