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Method interferences from known PP2A inhibitors. Pooled urine spiked with 0.500 ng/mL of PP2A inhibitors prior to IC (gray bars) were compared to 5.00 ng/mL post-spike controls (black bars). Significance was determined by unpaired t-test. * p ≤ 0.05, *** p ≤ 0.005, **** p ≤ 0.0001, n.d. = not detected. Error bars represent the standard deviation of duplicate samples.
