Erratum for vol. 104, p. 3410

In the response letter by Arbab et al entitled “Feride–protamine sulfate labeling does not alter differentiation of mesenchymal stem cells,” which appeared in the November 15, 2004, issue of Blood (Volume 104:3412-3413), the title's first word was incorrect. The title should read “Ferumoxide–protamine sulfate labeling does not alter differentiation of mesenchymal stem cells.”