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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 is a globular protein made up of four subunits, each of which contains a polypeptide chain called globin and a heme group. Each hemoglobin molecule is composed of two types of globins organized into four subunits.The two sets of globin chains have minute differences in the sequence and types of amino acids comprising them. This amino acid sequence of a protein is called the primary structure.ach hemoglobin molecule is composed of two types of globins organized into four subunits. The two sets of globin chains have minute differences in the sequence and types of amino acids comprising them. This amino acid sequence of a protein is called the primary structure.