Periplasmic Expression of 4/7 α-Conotoxin TxIA Analogs in E. coli Favors Ribbon Isomer Formation - Suggestion of a Binding Mode at the α7 nAChR. - El Hamdaoui Y; Wu X; Clark RJ; Giribaldi J; Anangi R; Craik DJ; King GF; Dutertre S; Kaas Q; Herzig V; Nicke A (Frontiers in pharmacology, 2019)