1025 Tumor-specific CD8+ T cells epigenetically licensed by IL-7R are critical for anti-tumor immunity in melanoma by Harriet Kluger, Nikhil Joshi, Marcus Bosenberg, Lilach Aizenbud, Noah Hornick, Esen Sefik, Goran Micevic, Andrew Daniels, Karine Flem-Karlsen, Koonam Park, Ronan Talty, Meaghan McGeary, Haris Mirza, Holly N Blackburn, Julie F Cheung, Akiko Iwasaki, Richard Flavell