title: Twelve families with Hb O Arab in the Burgas district of Bulgaria. Observations on sixteen examples of Hb O Arab-beta (0) thalassaemia.
mesh_terms: D002031:Bulgaria; D005787:Gene Frequency; D006455:Hemoglobins, Abnormal; D006579:Heterozygote; D006801:Humans; D010375:Pedigree; D013789:Thalassemia / Q000097:blood / Q000235:genetics*
chemical_list: D006455:Hemoglobins, Abnormal