Bacterial Biosensors for in Vivo Spatiotemporal Mapping of Root Secretion. ‌ Pini, F, East, A, Appia-Ayme, C, Tomek, J, Karunakaran, R, Mendoza-Suárez, M, Edwards, A, Terpolilli, J, Roworth, J, Downie, J, Poole, P