4NSO:
reference: Structural basis for recognition of the type VI spike protein VgrG3 by a cognate immunity protein., Zhang J, Zhang H, Gao Z, Hu H, Dong C, Dong YH, FEBS Lett. 2014 May 21;588(10):1891-8. doi: 10.1016/j.febslet.2014.04.016. Epub, 2014 Apr 18. PMID: 24751834

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