Figure 1From: Standardization and performance evaluation of mononuclear cell cytokine secretion assays in a multicenter studyEffect of cryopreservation on PBMC secretion of IL-10 and IL-2. Mean response ratios were calculated for IL-10 (A) and IL-2 (B) for cells cryopreserved with either the Nalgene or constant rate freezer methods. Whiskers represent the 95% confidence intervals for difference. See methods for details of statistical analysis.Back to article page