Low fetal hemoglobin rates in patients carrying Thai (  )0-deletion and Turkish (  )0-deletion/inversion strengthen the hypothesis that the 5'  BCL11A binding site plays a major role in its fetal hemoglobin inhibitory regulation. Response to "The 12.6 kb-deletion in the  -globin gene cluster is the known Thai/Vietnamese (  )0-thalassemia commonly found in Southeast Asia"