3VZT:
reference: Structural basis for solute transport, nucleotide regulation, and immunological recognition of Neisseria meningitidis PorB., Tanabe M, Nimigean CM, Iverson TM, Proc Natl Acad Sci U S A. 2010 Apr 13;107(15):6811-6. Epub 2010 Mar 29. PMID: 20351243

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