Sensitive red fluorescent indicators for real-time visualization of potassium ion dynamics in vivo. - Yang, Lina; Pathiranage, Vishaka; Zhou, Shihao; Sun, Xiaoting; Zhang, Hanbin; Lai, Cuixin; Gu, Chenlei; Subach, Fedor V.; Drobizhev, Mikhail; Walker, Alice R.; Piatkevich, Kiryl D. (PLoS Biology, 2025)