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Interaction between activation of A3R and A2R. A A3R agonist IB-MECA still dilated the preconstricted Af-Art in the presence of a A2R antagonist ZM241385 (A), but did not dilate the preconstricted Af-Art in the presence of a A3R antagonist MRS 1191 (B). *P < 0.05 vs. corresponding control.
