In the article entitled “Defective development of NK1.1+ T-cell antigen receptor αβ+ cells in zeta-associated protein 70 null mice with an accumulation of NK1.1+CD3 NK-like cells in the thymus,” which appeared in the March 15, 2001, issue of Blood(97:1765-1775), in Figure 10 the thymocytes should have been described as NK1.1+ TCRαβ thymocytes.