CD107a and intracellular cytokine staining of PBMCs from PIN 5 12 months after transplantation. PBMCs were stimulated for 5 hours with the tumor-specific peptide, left unstimulated or stimulated with CMV peptides or PMA/ionomycin as positive controls. The data show percentage of CD107a mobilization and IL-2, TNF-α, and IFN-γ secretion after stimulation with the relevant peptide.