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. 2011 Oct 20;7(10):e1002308. doi: 10.1371/journal.ppat.1002308

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gp350 antibody levels in naturally infected monkeys are shown. Antibody levels are measured as luminometer units. Cut off value is shown as horizontal dotted line, which was determined as the mean +2 standard deviations of the blank signal (open circles). Horizontal bars indicate geometric mean, asterisks indicate p<0.05 (Mann-Whitney's U-test), NS indicates not significant.