Reduced frequencies of EBV-specific cells in GMCs, as assessed by ELISPOT assay.

Median frequencies of EBV-reactive cells in PBMCs, Co cells, and GMCs from 6 donors, stimulated by autologous (white bars) or allogeneic (black bars) B-EBV cell lines in 8 independent ELISPOT assays. * indicates P < .05 as compared with PBMCs; †,P < .05 as compared with Co cells.