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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 globin in hemoglobin contains one heme *Heme is a porphyrin molecule that contains iron *Each heme iron can bind one oxygen molecule (so each hemoglobin molecule can bind a maximum of 4 oxygen molecules *Iron gives RBC its red color.Each globin in hemoglobin contains one heme *Heme is a porphyrin molecule that contains iron *Each heme iron can bind one oxygen molecule (so each hemoglobin molecule can bind a maximum of 4 oxygen molecules *Iron gives RBC its red color.