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96-well plate layout utilized for the p400HR ring trial. All samples were delivered to each lab frozen in cryovials on dry ice, and prepared by each laboratory according to a standard operating procedure (SOP). In the Figure, “Cal” represents calibrators (low =1 to high =7), “QC” represents spiked quality control samples (low =1, mid =2, high=3), and samples labeled 01–12 were blinded to each lab. The blinded sample set is listed beneath the plate layout.
