A, schematic drawing of the experimental set‐up. Stim, stimulation; Imon, current monitor. B, mitral cell synaptic currents evoked by single pulse stimulation of sensory axons in the absence and presence of adenosine (100 μm). C, expression of synapto‐pHluorin in olfactory sensory axons. D, adenosine (100 μm) did not alter stimulation‐induced synapto‐pHluorin fluorescence transients.