6EHC:
reference: Unusual Constriction Zones in the Major Porins OmpU and OmpT from Vibrio cholerae., Pathania M, Acosta-Gutierrez S, Bhamidimarri SP, Basle A, Winterhalter M, Ceccarelli M, van den Berg B, Structure. 2018 Apr 3. pii: S0969-2126(18)30091-1. doi:, 10.1016/j.str.2018.03.010. PMID: 29657131

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