A pharmacological master key mechanism that unlocks the selectivity filter gate in K+ channels by Schewe, M, Sun, H, Mert, Ü, Mackenzie, A, Pike, A, Schulz, F, Constantin, C, Vowinkel, K, Conrad, L, Kiper, A, Gonzalez, W, Musinszki, M, Tegtmeier, M, Pryde, D, Belabed, H, Nazare, M, De Groot, B, Decher, N, Fakler, B, Carpenter, E, Tucker, S, Baukrowitz, T