modifies has causal genotype Hemoglobin H Disease Beta Thalassemia Trait Beta Thalassemia Minor Beta-Thalassemia Trait B-/B Heterozygosity for Beta-Thalassemia Few but definitions not freely available Heterozygous Beta-Thalassemia Request inclusion into relevant ontology. Perhaps below "clinical subtype" in Orphanet. The exact synonym "B+/B" has been changed to "B-/B", as per the change in convention from "Beta Plus Thalassemia" to "Beta Minus Thalassemia". B0/B http://en.wikipedia.org/wiki/Beta_thalassemia The inheritance of only one mutated beta-globin allele (beta+ or beta0). Clinical Phenotype of Beta Thalassemia Thalassemia Trait Beta Thalassemia Mutation