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Parasite-induced changes in gene expression in the Lymnaea CNS. The percentage change in transcript levels in parasitized animals at 1.5 hr, 5 hr, 6 weeks, and 8 weeks postinfection was measured by reverse Northern blot analysis, compared with transcript levels in control animals of the same size and age (mean ± SD; n = 3). Changes in cytochrome P450 levels are set at 0% to correct for unequal labeling of cDNA probes. * indicate significant changes (P < 0.05 unpaired t test).
