Naïve splenocytes were plated at a concentration of 100,000–200,000 cells/well in 100 µL serum-free C.T.L. media (Cellular Technology, Ltd., Shaker Heights, OH) on precoated murine IFNγ ELISPOT plates (Cellular Technology, Ltd., Shaker Heights, OH). Harvested TIL were added at a final concentration of 25,000 cells/well in 200 µL with peptide (10 µM) (Peptide 2.0 Inc., Chantilly, VA). Concavalin A (1 µg/well) was a positive control. Plates were incubated overnight at 37°C and analyzed using the C.T.L. ImmunoSpot kit (Cellular Technology, Ltd., Shaker Heights, OH).
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