8:30 AM. 227. Engineered Immunological Niche Reveals Immune Signatures of Islet Allograft Rejection.Jyotirmoy Roy1, Abdalmonam Nejma2, Mohammad Tarique2, Shengli Wu2, Brianna Ha1, Esma Yolcu2, Lonnie Shea1 1University of Michigan, 2University of Missouri