- Inhibition of dipeptidyl aminopeptidase IV (DP-IV) by Xaa-boroPro dipeptides and use of these inhibitors to examine the role of DP-IV in T-cell function. Flentke, G.R., Munoz, E., Huber, B.T., Plaut, A.G., Kettner, C.A., Bachovchin, W.W. Proc. Natl. Acad. Sci. U.S.A. (1991)