Raman imaging of the phycosphere reveals sharp gradients of organic matter exuded by single phytoplankton cells - Zachary C. Landry; Riccardo Foffi; Valerio Anelli; Paolo Arosio; Marcos Gil-García; Richard J. Henshaw; Oliver Müller; Giacomo Paccagnan; Timo N. Schneider; Carsten J. Schubert; Jonasz Słomka; Kang Soo Lee; et al. (Proceedings of the National Academy of Sciences, 2026)