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Population spike (PS) amplitudes (percentage change from baseline values) over 8 hr and a 24 hr value for rats that experienced a 2 min swim after tetanus and were injected with a β-adrenergic antagonist (A) or a protein-synthesis inhibitor (B) (p = 0.004, 0.03, 0.0001, levels for increasing time points). Means ± SEM are given. Asterisks indicate significant time point differences. Dashed lines indicate the 100% level.
