6Q4R:
reference: High-Resolution Crystal Structure of Endoplasmic Reticulum Aminopeptidase 1 with Bound Phosphinic Transition-State Analogue Inhibitor., Giastas P, Neu M, Rowland P, Stratikos E, ACS Med Chem Lett. 2019 Feb 13;10(5):708-713. doi:, 10.1021/acsmedchemlett.9b00002. eCollection 2019 May 9. PMID: 31097987

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