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Inhibition of FAP enzymatic activity on Suc-Gly-Pro-AMC substrate by Ga-AV02053 and Ga-AV02070, and comparison with the data obtained previously using Ga-FAPI-04 [31]. The enzymatic activity represents the fluorescence of AMC which was cleaved by human FAP enzyme. The half-maximal inhibitory concentration (IC50) of the Ga-complex ligands was calculated, with Ga-FAPI-04 showing the lowest value, followed by Ga-AV02070 and Ga-AV02053. Error bars indicate standard deviations.
