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Mean metacestode tissue masses (in mg) at 1 and 4 months postinfection (p.i.) (1 M and 4 M, respectively). White bars represent the values obtained from wild-type (WT) mice, black bars the values from inducible nitric oxide synthase-knockout (iNOS-KO) mice. Indicated are the mean values + standard errors per group of 20 mice (data represent four independent experiments with five animals per each group). *Statistically significant differences (P < 0.05).
