title: Secretor status of donors in Dar es Salaam.
mesh_terms: D000017:ABO Blood-Group System; D044383:Black People; D001782:Blood Donors; D005260:Female; D006801:Humans; D008297:Male; D012463:Saliva / Q000032:analysis; D013636:Tanzania
chemical_list: D000017:ABO Blood-Group System