An endoplasmic reticulum-targeting NIR fluorescent probe for viscosity imaging in vitro and vivo. - Tang, Jian-Hua; Yu, Jing-Jing; Niu, Jun-Tao; Han, Tong; Cui, Jia-Le; Di, Yi-Ran; Liang, Ting; Kang, Yan-Fei; Fan, Hao-Jun (Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy, 2026)