6TOP:
reference: Crystal structure of Type IX secretion system PorE C-terminal domain from Porphyromonas gingivalis in complex with a peptidoglycan fragment., Trinh NTT, Tran HQ, Van Dong Q, Cambillau C, Roussel A, Leone P, Sci Rep. 2020 Apr 30;10(1):7384. doi: 10.1038/s41598-020-64115-z. PMID: 32355178

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