NCIt definition : A heterozygous state in which a person has a hemoglobin S allele along with a beta-thalassemia
allele. The severity of the condition is determined to a large extent by the quantity
of normal hemoglobin produced by the beta-thalassemia gene.;
Alternative definition : NICHD: A heterozygous state in which a person has a hemoglobin S allele along with
a beta-thalassemia allele. The severity of the condition is determined to a large
extent by the quantity of normal beta-globin produced by the beta-thalassemia gene.;