1X2E:
reference: Unusual extra space at the active site and high activity for acetylated hydroxyproline of prolyl aminopeptidase from Serratia marcescens., Nakajima Y, Ito K, Sakata M, Xu Y, Nakashima K, Matsubara F, Hatakeyama S, Yoshimoto T, J Bacteriol. 2006 Feb;188(4):1599-606. PMID: 16452443

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