title: Evolution of sickle variant gene.
mesh_terms: D000349:Africa; D000755:Anemia, Sickle Cell / Q000235:genetics*; D003434:Crossing Over, Genetic; D005796:Genes; D005838:Genotype; D005914:Globins / Q000235:genetics; D006451:Hemoglobin, Sickle / Q000235:genetics; D006801:Humans; D009154:Mutation; D012805:Sickle Cell Trait / Q000235:genetics*; D013997:Time Factors
chemical_list: D006451:Hemoglobin, Sickle; D005914:Globins