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(a) Intracellular intensity of HeLa S3 cells (averaged over 21 cells, λex = 405 nm, λem 530–570 nm) over time when incubated with 1 (green) or 2 (blue) at 2 μM, in the presence of ZnCl2 (50 μM) and sodium pyrithione (50 μM). (b) Same comparison between 3 (green) and 4 (blue).
