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Fig. 4. The variation in the fluorescence ratio (F/F0) of BNQ (5 μM) after adding 15 equiv. of different metal cations (black bar) and after adding 1.5 equiv. Cu2+ in the presence of 15 equiv. of various cations (red bars). (λex = 390 nm, λem = 520 nm, slits: 10/5, DMSO/HEPES = 1/9).