the clinical and haematological phenotype as well as chain synthesis data were studied in 35 doubly heterozygous patients with either normal hb a2 and hb f , type 2 beta thalassaemia and beta ( high a2 ) thalassaemia ( 26 patients ) , or type 2 and other rare beta or delta beta variants ( nine patients ) .
C0005283
beta thalassaemia
C0039730
thalassaemia