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Intra-assay reproducibility across assay durations for all cell lines. The intra-assay reproducibility was assessed using SD (log10). All replicates within one concentration were compared. The two-, three-, and fivefold levels of SD log10 are indicated from bottom to top, respectively, by horizontal lines. P < 0.05 indicates the SD (log10) at which there is 90% confidence to find a fivefold difference (4).
