title: Effect of the sickle-cell gene on the age of the menarche in Nigerian girls.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D005260:Female; D005838:Genotype; D006451:Hemoglobin, Sickle / Q000235:genetics*; D006801:Humans; D008572:Menarche
chemical_list: D006451:Hemoglobin, Sickle