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Histogram of cysteine protease activity in salivary gland lysates. Parotid (PAR) and submandibular (SMX) gland lysates were incubated with chromagenic substrate, BAPNA, for 60 min at 37°C (P-DM and DM, prediabetic and diabetic, respectively). Standard curve was generated by linear regression analysis of papain digestion of BAPNA. All values represent the mean ± SE performed in duplicate on three separate occasions.
