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RNA titers (in genomic equivalents per gram) of HuNoV, SaV, and TV internalized through the petiole of lettuce and spinach plants into their central veins and leaf lamina (lower and upper portions). Asterisks indicate significant differences in RNA titers between time points (see Materials and Methods), and different letters indicate significant differences among tissues. The assay detection limit was 2.69 log10 GE/g.
