In the article by Serody et al, “Murine T Lymphocytes Incapable of Producing Macrophage Inhibitory Protein-1α Are Impaired in Causing GVHD Across a Class I but not Class II MHC Barrier,” which appeared in the January 1, 1999 issue (Volume 93, No 1, pp 43-50), a correction should be noted: Figure 5 was mislabeled in the original manuscript. The figure and legend are printed below in their entirety.