Xlt hough the enzymes aminopolypep tidasc: amiiiodipeptidascl, iLnd leucyl aminopeptidase have been de~ cribed~*~~-j, it is not, knotvii whether there exists one non- specific aminopeptidase or many aminopeptidases specific for each amino acid. Since a. biochemical and histochemical method for leucyl aminopeptidase has been described iitilizing~-leucyl-2-naphthylamide as the subst, r: ite,” 6 a series of tiaph thylamides of ...