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Increased levels of fetal hemoglobin (HbF, α2γ2) may reduce sickle cell anemia severity due to its ability to inhibit HbS polymerization and also reduce the mean corpuscular HbS concentration. We have investigated the influence of three known major loci on the HbF trait (HBG2, rs748214; BCL11A, rs4671393; and HBS1L-MYB, rs28384513, rs489544 and rs9399137) and HbF levels in SCA patients from the State of Pará, Northern Brazil. Our results showed that high levels of HbF were primarily influenceddoi:10.1016/j.bcmd.2014.07.006 pmid:25084696 fatcat:kaaeqaz3mvezzlp4yg3teeumwe