T-cell receptor spectratyping. (A) Boxplot of number of bands per Vβ family (1-24) at 4 and 6 months after SCT for evaluable dose levels 1 and 2 patients. Line indicates mean; box indicates 25th to 75th centile; and error bars indicate 90th and 10th percentile. (B) Representative plots of TCR Vβ repertoire in P11 (dose level 2) at 4, 6, and 12 months after SCT.