A Coumarin-Based Probe for Sequential ON–OFF–ON Detection of Cu 2+ and Biothiols: Naked-Eye Detection, Smartphone RGB Readout and In Vivo Imaging. - Wei, Mingjie; Zheng, Linxin; Tian, Weilong; Wang, Xingfeng; Liu, Rong; Chen, Lijuan; Niu, Li (Biosensors (2079-6374), 2026)