5XHQ:
reference: Crystal structure of E. coli apolipoprotein N-acyl transferase., Lu G, Xu Y, Zhang K, Xiong Y, Li H, Cui L, Wang X, Lou J, Zhai Y, Sun F, Zhang XC, Nat Commun. 2017 Jul 4;8:15948. doi: 10.1038/ncomms15948. PMID: 28885614

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