pMFG-OVA257–264-Cerulean, pMFG-GP61–80-Cerulean, and pMFG-OVA257–264-GP61–80-Ceruelan plasmids were constructed by inserting annealed oligonucleotides encoding triple SIINFEKL-AAY repeats, GLKGPDIYKGVYQFKSVEFD, or (SIINFEKL-AAY)3-P2A-GLKGPDIYKGVYQFKSVEFD, respectively, into the NcoI-linearized pMFG-Cerulean vector, as previously described [45 (link)]. Restriction enzymes were purchased from New England Biolabs. All constructs were verified by sequence analysis. Phoenix packaging cells (ATCC) were transfected with pMFG constructs; supernatants were used to transduce B16-F10 mouse melanoma tumor cell line to generate B16-F10 OVA257–264-Cerulean, B16-F10GP61–80-Cerulean and B16-F10 OVA257–264-GP61–80-Cerulean, respectively [45 (link)]. Transduced bulk cell lines were sorted for similar Cerulean expression levels.