Monitoring of infused CTLs. PBMCs from patients' peripheral blood were analyzed by TCR spectratyping method to detect infused CTLs. (A) Trace analysis of BV subfamily 3 (204 base pair peak) in patient 17's PBMCs before and after infusion. (B) Trace analysis of BV subfamily 4 (341 base pair peak) in patient 22's PBMCs before and after infusion. Pre-inf indicates before CTL infusion; h, hours; and d, days.