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O2 changes induced by local delivery of adrenoceptor agonists with iontophoresis. Example responses to methoxamine (α1 agonist, A), clonidine (α2 agonist, B), and isoproterenol (non-selective β-agonist, panel C) are shown for different recording locations. The recording potential for O2 is indicated by the whited dashed lines. Ejection times (1 second in duration) are denoted by the gray dashed bars and the red bars.
