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Optimization of labeling conditions of Au26 cluster for MT1-MMP. (A) Fluorescence imaging of Siha cells treated with different concentrations of Au clusters for 30 min. (D) Fluorescence imaging of Siha cells treated with 8 μM Au clusters at different times. (B,E) Fluorescence intensity analysis corresponds to A and D. Each point represents the fluorescence intensity of a cell. (C,F) The average amount of Au determined by ICP-MS on Siha cells corresponding to A and D. ** p < 0.01.
