Biodegradable targeted polymeric mRNA nanoparticles enable in vivo CD19 CAR T cell generation and lead to B cell depletion. - Jain M; Est-Witte SE; Shannon SR; Neshat SY; Yu X; Dunham S; Tian T; Cheng L; Harris J; Konig MF; Tzeng SY; Schneck JP; et al. (Science advances, 2026)