da Silva MCF, Zuccherato LW, Lucena FC, et al. Extensive admixture in Brazilian sickle cell patients: implications for the mapping of genetic modifiers. Blood. 2011;118(16):4493-4495.

On page 4494 in the 20 October 2011 issue, there is an error in the third sentence of the second paragraph: “3.5% Amerindian” should read “8.4% Amerindian.”