benzyloxycarbonyl-, biotinyl-, and peptidyl-Gly-Pro substrates, which DPPIV cleaves poorly (Edosada et al., 2006b). Accordingly, Acyl-Gly-boroPro has a markedly increased specificity for FAP versus other post-prolyl peptidases (Edosada et al., 2006b) andpeptidyl chloromethyl ketoneshave been ...