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Cellular luminescence images of A549 cells cultivated with 5 mM Pyruvate, 10 mM lactate, or a mixture of 5 mM pyruvate and 10 mM lactate in glucose-deficient DMEM medium for 30 min and then treated with 10 μM probe A in glucose-deficient DMEM medium for 30 minutes. The image fluorescence signals were gathered from 550 nm to 650 nm under 488 nm excitation.
