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Thalassemias are forms of inherited autosomal recessive blood disorders that originated in the Mediterranean region. In thalassemia, the disorder is caused by the weakening and destruction of red blood cells. Thalassemia is caused by variant or missing genes that affect how the body makes hemoglobin. Hemoglobin is protein in the red blood cells that carries oxygen. People with thalassemia make less hemoglobin and have fewer circulating red blood cells than normal, which results in mild or severe anemia.
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