SSX2 and melanoma: The class I-matched artificial APCs were pulsed with overlapping peptides (20-mers with an overlap of 15 amino acids) to cover the whole proteins of six shared antigens (MART1, NY-ESO-1, SSX2, gp100, MAGE-A1, and survivin) that are frequently expressed by melanomas (Finn, 2018b; Supplementary file 2) and used as stimulators in cytokine ELISPOT assays.