949 Flexible control of T cell memory and self-renewal by a reversible epigenetic switch by Wei Yang, Rafi Ahmed, Jay Shendure, Kenneth Ng, Rajesh Valanparambil, Allan Wang, Kathleen Abadie, Elisa C Clark, Obinna Ukogu, Riza Daza, Jumana Fathima, Avinash Bhandoola, Hao Nourmohammad, Junyue Cao, Hao Yuan Kueh