1WN2:
reference: Structure of peptidyl-tRNA hydrolase 2 from Pyrococcus horikoshii OT3: insight into the functional role of its dimeric state., Shimizu K, Kuroishi C, Sugahara M, Kunishima N, Acta Crystallogr D Biol Crystallogr. 2008 Apr;64(Pt 4):444-53. Epub 2008, Mar 19. PMID: 18391411

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