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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 the protein molecule in red blood cells that carries oxygen from the lungs to the body's tissues and returns carbon dioxide from the tissues back to the lungs.Hemoglobin is made up of four protein molecules (globulin chains) that are connected together.The normal adult hemoglobin (Hbg) molecule contains two alpha-globulin chains and two beta-globulin chains.In fetuses and infants, beta chains are not common and the hemoglobin molecule is made up of two alpha chains and two gamma chains.emoglobin is made up of four protein molecules (globulin chains) that are connected together. The normal adult hemoglobin (Hbg) molecule contains two alpha-globulin chains and two beta-globulin chains.