2:45 PM. 200. Engineering an Immunostimulatory Niche to Potentiate mRNA Lipid Nanoparticle Cancer Vaccines.Jingyao Ma, M.S.1, Yining Zhu, PhD1, Kailei Goodier, M.S.1, Xiang Liu, PhD1, Junru Liao1, Milun Jain1, Christine Wei, BS1, Di Yu1, Xiaoya Lu, MS1, Yunhe Su, M.S.1, Jinghan Lin, M.S.1, Hai-Quan Mao, PhD1 1Johns Hopkins University