Antibody reactivity against 6 antigens. (A) Antibody reactivity in plasma of HSCT patients and healthy donors (HD) against the 6 antigens listed were tested with the FACS-based antigen-trapping bead assay. Fluorescence intensities are displayed as heatmap with Excel conditional formatting by equalizing the highest intensity of each antigen. (B) The percentages of high producers for each antigen. High producers were defined as having florescence intensity values for the specific antigen greater than the 95th percentile of HD. (C) The P values between groups in panel B for each antigen. Ab, antibody; Ag, antigen.