Cryo‐EM structures of pentameric autoinducer‐2 exporter from Escherichia coli reveal its transport mechanism by Khera, R, Mehdipour, AR, Bolla, JR, Kahnt, J, Welsch, S, Ermler, U, Muenke, C, Robinson, CV, Hummer, G, Xie, H, Michel, H