Pmel-1 (B6.Cg-/Cy Tg [TcraTcrb] 8Rest/J), Rag2−/−, OT-II (B6.Cg-Tg (TcraTcrb)425Cbn/J), and C57BL/6 mice were obtained from the Jackson Laboratory. C57BL/6 male mice of 6-8 weeks of age were used as recipient hosts for adoptive transfer unless otherwise indicated. We crossed Pmel-1 with Ly5.1 mice (B6.SJL-PtprcaPepcb/BoyJ) to obtain Pmel-1 Ly5.1 mice. We crossed OT-II with Rag2-/- to obtain OT-II Rag-/- mice. All mice were maintained under specific pathogen–free conditions. B16 (H-2Db), a murine melanoma, transduced as previously described31 (link) to express gp100 with human residues at position 25-27; EGS -> KVP. Mel624 was obtained from ATCC and Platinum-E ecotropic packaging cells were obtained from Cell Biolabs. Cell lines and maintained in DMEM media with 10% FBS, 1% glutamine and 1% penicillin-streptomycin.