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Pial arteriolar dilation in response to isoproterenol (ISO; 10-7 M) and to adenosine diphosphate (ADP; 10-4 M) before and after treatment with L-2-α-aminoadipic acid (L-2αAAA; 5 h, 2 mM). Values are means ± SEM. N = 14. *P < 0.05 compared with preceding bar.
