Inside Front Cover: Visual β‐Sheet‐to‐β‐Turn Transition in Luminescent Polymeric Vesicles for Color‐Reporting Drug Delivery (Angew. Chem. Int. Ed. 37/2025)

A tetraphenylethylene-conjugated poly(L-cysteine) vesicle was engineered to execute a β-sheet-to-β-turn conformational transformation driven by reactive oxygen species-mediated thioether oxidation, as reported by Mingming Ding et al. (e202503875). The transition boosted fluorescence and circularly polarized luminescence, enabling dual-modal tracking of conformational changes, and mediated a full color-reportable drug release, allowing efficient imaging and treatment of tumors.