Vol. 206, No. 2, February 16, 2009. Pages 387–398.

Due to clerical error, incorrect data were displayed in the original Figure 6, panel d, resulting in the inadvertent duplication of data in panels a and d. The corrected figure is below.

In addition, on page 394, paragraph three, the final sentence should read, “For each of the four leukemic cell lines tested, cells from RA83-treated mice produced T cell–mediated lytic responses and, for two of the cell lines, these responses were equal to or greater than those from the cells from RAneg-treated hu-SCID mice (Fig. 6, c–f).”