NCIt definition : A disorder characterized by the body's inability to synthesize beta-globin chains,
leading to the formation of abnormal hemoglobin and anemia. This inherited autosomal
recessive blood disorder is caused by germline mutation of the HBB gene.;
Alternative definition : NICHD: A heterozygous state in which a person has a loss of function mutation in one
beta globin allele together with a hemoglobin S allele.;