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Two-hours post-exposure relative expression of candidate immune system genes in Experiment F (Sp1, German clones). The expression of the German GG4 Daphnia clone relative to the expression of reference genes is given. For each gene, the mean expression in individuals exposed to the parasite (Sp1 Pasteuria strain; white bars) or to the placebo solution (black bars) is presented; error bars represent the standard error. See statistics in text.
