2RQX:
reference: Solution structure and phospho-PmrA recognition mode of PmrD from Klebsiella pneumoniae., Luo SC, Lou YC, Cheng HY, Pan YR, Peng HL, Chen C, J Struct Biol. 2010 Dec;172(3):319-30. Epub 2010 Jun 9. PMID: 20538060

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