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Copy numbers of all 152 polA-positive samples. Each dot represents a positive mean copy number of triplicates from one sample. Negative results were excluded. All data were converted to logarithms and analyzed. Significance was determined using the Wilcoxon matched-pairs test between WBL and other fractions. *, P < 0.05; ***, P < 0.001. Abbreviations: WB, whole blood; WBL, whole blood/lysed RBCs; BCL, blood cells/lysed RBCs.
