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H emoglobin diseases are a group of blood disorders passed down through families in which there is an abnormal production or structure of the hemoglobin protein.
Hemoglobin is a protein that's made of four polypeptide chains. Each of these chains contains a heme group. Therefore, every hemoglobin molecule has the ability to bind four molecules of oxygen. Hemoglobin is the primary protein found in red blood cells, or erythrocytes.Each erythrocyte contains hundreds of thousands of hemoglobin molecules.ach of these chains contains a heme group. Therefore, every hemoglobin molecule has the ability to bind four molecules of oxygen. Hemoglobin is the primary protein found in red blood cells, or erythrocytes. Each erythrocyte contains hundreds of thousands of hemoglobin molecules.