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a–b Effect of PDL-1, PDL-2, and nivolumab on QC sample performance. a sPD-1 in a melanoma serum sample measured in the absence or presence of 20 nM (1 μg/mL) of human PDL-1 or PDL-2 proteins. b QC performance from analytical runs in the absence or presence of 685 nM (100 μg/mL) nivolumab. Results are shown as mean and SD of each group (n = 2–4)
