2V5H:
reference: The crystal structure of the complex of PII and acetylglutamate kinase reveals how PII controls the storage of nitrogen as arginine., Llacer JL, Contreras A, Forchhammer K, Marco-Marin C, Gil-Ortiz F, Maldonado R, Fita I, Rubio V, Proc Natl Acad Sci U S A. 2007 Nov 6;104(45):17644-9. Epub 2007 Oct 24. PMID: 17959776

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