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Determination of the inhibitory constant (K i) of Leu‐enkephalin (A) or PnPP‐19 (B) on the hydrolytic activity of neutral endopeptidase (NEP). The assays were performed using the FRET‐substrate Abz‐(d)Arg‐Gly‐Leu‐Eddnp. Inset: Residual activity in the presence of different inhibitors concentrations.
