although their response to caffeine differed , the strains did not differ in response to the a1 adenosine agonist l-phenylisopropyladenosine ( pia ) nor in the binding of the a1 agonist [ 3h ] n6-cyclohexyladenosine ( cha ) in various brain regions .
C0001443
adenosine
C0031484
phenylisopropyladenosine