Title: Hino M, et al. X-Prolyl dipeptidyl-aminopeptidase activity, with X-proline p-nitroanilides as substrates, in normal and pathological human sera. Clin Chem. 1976 Aug;22(8):1256-61.
Title: Chen YS, et al. Purification and characterization of human prolyl dipeptidase DPP8 in Sf9 insect cells. Protein Expr Purif. 2004 May;35(1):142-6.
