Analysis of cross-stimulation and cross-recognition of NY-ESO-1 peptides S9C, S11L, and L9L. ELISPOT with CD8+ T cells from vaccinated patient ES-E03 presensitized with the different NY-ESO-1 peptides and tested at day 9 against T2 cells pulsed with S9C (vertical stripes), S11L (solid), L9L (horizontal stripes), or without peptide (open).