Sub‐Second Ratiometric Fluorescence Imaging of Histamine Dynamics in Living Cells via a Supramolecular Probe
ABSTRACT Histamine (HA) is a critical neurotransmitter, yet its intracellular dysregulation remains difficult to monitor due to the slow kinetics and environmental sensitivity of traditional fluorescent probes. Herein, we report a supramolecular ratiometric probe engineered via the host–guest self‐assembly of cationic...