Correction

MEDICAL SCIENCES, IMMUNOLOGY. For the article “Natural killer cells attack tumor cells expressing high levels of sialyl Lewis x oligosaccharides,” by Chikara Ohyama, Satoru Kanto, Kazunori Kato, Osamu Nakano, Yoichi Arai, Tetsuro Kato, Shihao Chen, Michiko N. Fukuda, and Minoru Fukuda, which appeared in number 21, October 15, 2002, of Proc. Natl. Acad. Sci. USA (99, 13789–13794; First Published October 7, 2002; 10.1073/pnas.212456599), Fig. 1 on page 13790 was inadvertently switched during the revision process with a previously published figure (1) showing results on B16 melanoma cells. The correct figure, summarizing the results on human MeWO melanoma cells transfected with α1,3-fucosyltransferase (FTIII), appears below. We apologize for any confusion caused by this mistake.

Figure 1.

Cell sorting and flow cytometric analysis of MeWo-FTIII cells. (A) MeWo-FTIII cells were stained with anti-sialyl Lewis x antibody (CSLEX-1) then by FITC-conjugated secondary antibody, and sorted by FACStar. Cells indicated by open bars were pooled and designated as MeWo-FTIII·N (negative), MeWo-FTIII·M (moderate), and MeWo-FTIII·H (highly positive). (B–F) Cultured MeWo-FTIII·N (N), MeWo-FTIII·M (M), and MeWo-FTIII·H (H) cells were subjected to flow cytometry analysis after staining with anti-sialyl Lewis x (B), anti-sialyl Lewis a (C), or anti-Lewis x antibody (D), followed by FITC-conjugated secondary antibody or FITC-conjugated Sambucus nigra agglutinin (E) or FITC-conjugated tomato lectin (F). HL-60 cells also were stained in B.