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Inhibition of in situ DPP-IV activity by Lup1 and Soy1: (a) after pre-incubation (1 h) with 100 µM Lup1 and Soy1, DPP-IV activity was inhibited by 50% by both peptides; (b) measuring inhibitory activity as a function of peptide concentration, a dose-dependent response was observed with IC50 values of 207.5 µM for Lup1 and 223.2 µM for Soy1. Data are the means ± SD of three experiments performed in triplicate. *: p > 0.05; **: p > 0.01.
