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The levels of (a) agmatine, (b) putrescine, (c) spermidine, and (d) spermine in the postrhinal cortex (POR), entorhinal cortex (EC), brain stem (BS), striatum (ST), and cerebellum (CE) in young and old rats. Data is presented as mean ± SEM. The asterisks indicate a significant difference between groups: ∗p < 0.05, ∗∗p < 0.01, and ∗∗∗p < 0.001.
