hearts treated with adenosine and r-phenylisopropyladenosine ( pia ) , an adenosine a1 receptor agonist , exhibited a significantly greater toic than control hearts ( 18.60 +/- 0.40 and 16.64 +/- 1.15 min , respectively vs 9.12 +/- 0.66 min ) , whereas phenylaminoadenosine , an adenosine a2 receptor agonist , had no effect on toic ( 11.73 +/- 0.87 min ) .
C0001443
adenosine
C0031484
phenylisopropyladenosine