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Fig. S1 Cyclic voltammograms for A.) 1 μM Propentofylline, B.) 1 μM Histidine and C.) 1 μM ABT-702. Propentofylline and histidine were dissolved in Tris-buffer. ABT-702 was dissolved in 1% DMSO in Tris-buffer.

Fig. S2 Cyclic voltammograms for Adenosine (black), Adenosine and 0.1% DMSO (red) and Adenosine and 0.1% DMSO and 0.1 μM ABT-702 (blue). The DMSO slightly decreases electrode sensitivity to adenosine, but no further decreases were seen with addition of ABT-702.

Fig. S3 Calibration of oxygen saturated Tris-buffer in a flow injection analysis system. The oxygen saturated buffer contained 870 μM dissolved oxygen. The reduction peak for oxygen around -1.3 V is clearly visible in the CV.

Fig. S4 Color plots and cyclic voltammograms of adenosine and oxygen changes in vivo (A) before and (B) 30 min. after propentofylline (15 mg/kg). The potentials for oxygen and adenosine are labeled in the color plot of panel (A). The cyclic voltammograms were taken 3 seconds after the stimulus was administered and the adenosine and oxygen peaks are labeled in panel (A).

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