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Fig. 4
In vitro biological properties of the 19F-peptide probes. A) Stability of peptides in bovine serum with increasing incubation time (0–7 days) at 37 °C. B) Viability of HeLa (left) and HEK293 (right) cell cultures exposed to various concentrations of peptide probes. The cell viability was obtained by monitoring the reduction of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT assay), where the amount of the formazan product (quantified by optical absorbance) was plotted as cell viability. 100% cell viability refers to untreated cells.
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