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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 contains four heme units each embedded in a globular protein sub-unit. There are two types of protein sub-units i.e., Î± and Î². Myoglobin contains only one heme unit surrounded by a globular protein, containing seven Î±-helical and six non helical segments, made up of 153 amino acids.Note: Heme moieties are shown in green color in above diagram. Fe(II) ion is shown in red color.here are two types of protein sub-units i.e., Î± and Î². Myoglobin contains only one heme unit surrounded by a globular protein, containing seven Î±-helical and six non helical segments, made up of 153 amino acids. Note: Heme moieties are shown in green color in above diagram.