Mean + SEM of 5 observations (Pb and Hg) or 10 observations (5 NaCl + 5 NaAc controls). The difference between noninjected controls and lead-treated animals is clearly significant; the difference between lead and NaAc animals is of borderline significance.
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The sentences
The lead-treated group is significantly different from normals (p < 0.01); the difference be- tween the lead and sodium group is borderline significant.