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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.
Each erythrocyte contains 200 to 300 molecules of hemoglobin, each molecule of hemoglobin contains four groups of heme, and each group of heme can carry one molecule of oxygen. A hemoglobin molecule contains four globin polypeptide chains composed of amino acids.Each polypeptide chain is composed of 141 to 146 amino acids. The absence, replacement, or addition of only one amino acid modifies the properties of the hemoglobin. hemoglobin molecule contains four globin polypeptide chains composed of amino acids. Each polypeptide chain is composed of 141 to 146 amino acids. The absence, replacement, or addition of only one amino acid modifies the properties of the hemoglobin.