TNFRSF9 and melanoma: Unseparated TIL and the post-REP CD137+ fraction were cocultured with four different target cells: (1) autologous, low passage melanoma cells; (2) allogeneic, low passage melanoma cells of patient #1 (HLA-A0201+); (3) established melanoma line mel 526 (HLA-A0201+); and (4) established melanoma line mel 888 (HLA-A0201−).