1P4N:
reference: Crystal structures of Weissella viridescens FemX and its complex with UDP-MurNAc-pentapeptide: insights into FemABX family substrates recognition., Biarrotte-Sorin S, Maillard AP, Delettre J, Sougakoff W, Arthur M, Mayer C, Structure (Camb) 2004 Feb;12(2):257-67. PMID: 14962386

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