Immunology. The article “Recombinant human migration inhibitory factor has adjuvant activity” by Weishui Y. Weiser, Lu-Ann M. Pozzi, Richard G. Titus, and John R. David, which appeared in number 17, September 1, 1992, of Proc. Natl. Acad. Sci. USA (89, 8049–8052), is being retracted. See also Correction in number 24, December 15, 1993, of Proc. Natl. Acad. Sci. USA (90, 12056) and Erratum in number 9, November 1, 1993, of J. Immunol. (151, last page, unnumbered). Weishui Y. WeiserLu-Ann M. Pozzi Richard G. Titus John R. David