- Different 3' end points of deletions causing delta beta-thalassemia and hereditary persistence of fetal hemoglobin: implications for the control of gamma-globin gene expression in man. Tuan, D., Feingold, E., Newman, M., Weissman, S.M., Forget, B.G. Proc. Natl. Acad. Sci. U.S.A. (1983)