Endogenous adenosine inhibits CNS terminal Ca(2+) currents and exocytosis.
Knott TK, Marrero HG, Fenton RA, Custer EE, Dobson JG, Lemos JR. Endogenous adenosine inhibits CNS terminal Ca(2+) currents and exocytosis. J Cell Physiol. 2007 Feb; 210(2):309-14.