1ORV:
reference: The crystal structure of dipeptidyl peptidase IV (CD26) reveals its functional regulation and enzymatic mechanism., Engel M, Hoffmann T, Wagner L, Wermann M, Heiser U, Kiefersauer R, Huber R, Bode W, Demuth HU, Brandstetter H, Proc Natl Acad Sci U S A 2003 Apr 29;100(9):5063-8. Epub 2003 Apr 10. PMID: 12690074

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