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In vitro confocal fluorescence uptake studies of 4.6 (10 μM) in HCT116 (CAIX positive) living cells (4 h incubation, 37 °C, λex = 405 nm, λem = 600 nm); (a) 4.6 uptake; (b) Lysotracker Red uptake; (c) overlay of images recorded after Lysotracker Red dye staining and 4.6 uptake (scale bar 10 μm).
