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The extracellular levels of cGMP in the prefrontal cortex of control and TAA rats: effect of intracortical administration of exogenous AdoHcy (2 mM). The results are the mean ± SEM, n = 6–7. Symbols indicate significance of differences in the post hoc Newman–Keuls test: *p < 0.05, **p < 0.01 versus control rats
