Cleavage cascade of the sigma regulator FecR orchestrates TonB-dependent signal transduction - Tatsuhiko Yokoyama; Ryoji Miyazaki; Takehiro Suzuki; Naoshi Dohmae; Hiroki Nagai; Tomoya Tsukazaki; Tomoko Kubori; Yoshinori Akiyama (Proceedings of the National Academy of Sciences, 2025)