NCIt definition : An individual who is heterozygous for the mutation that causes sickle cell anemia.;
Alternative definition : NICHD: A condition in which the individual is heterozygous for the beta globin gene,
displaying one normal and one abnormal allele (hemoglobin S mutation). The individual
almost never displays symptoms of sickle cell anemia, but may manifest symptoms if
the body experiences significant physical stress, including severe illness or prolonged
hypoxemia. The trait has been found to be protective against contracting malaria.;