5NEC:
reference: TonB-Dependent Receptor Repertoire of Pseudomonas aeruginosa for Uptake of Siderophore-Drug Conjugates., Luscher A, Moynie L, Auguste PS, Bumann D, Mazza L, Pletzer D, Naismith JH, Kohler T, Antimicrob Agents Chemother. 2018 May 25;62(6). pii: AAC.00097-18. doi:, 10.1128/AAC.00097-18. Print 2018 Jun. PMID: 29555629

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).