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Metabolic activity of the kidney microphysiological system after short or long drug exposure. Cells in the kidney microphysiological system were continuously exposed to each of three drugs for (a) 2 days or (b) 10 days. Measures of PrestoBlue (Invitrogen, Carlsbad, CA), an indicator of metabolic activity, at day 10 were normalized to day 0 measures of individual replicates within each group.
