Hemoglobin S rates in as heterozygotes.
D001741:Black or African American; D000755:Anemia, Sickle Cell; D044383:Black People; D001774:Blood Chemical Analysis; D005007:Ethnology; D005828:Genetics, Population; D006169:Guinea-Bissau; D006455:Hemoglobins, Abnormal / Q000453:epidemiology*; D006801:Humans; D011174:Portugal
D006455:Hemoglobins, Abnormal