5YP3:
reference: Crystal structures of a bacterial dipeptidyl peptidase IV reveal a novel substrate recognition mechanism distinct from that of mammalian orthologues., Roppongi S, Suzuki Y, Tateoka C, Fujimoto M, Morisawa S, Iizuka I, Nakamura A, Honma N, Shida Y, Ogasawara W, Tanaka N, Sakamoto Y, Nonaka T, Sci Rep. 2018 Feb 9;8(1):2714. doi: 10.1038/s41598-018-21056-y. PMID: 29426867

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