non-metabolizable analogs of adenosine , 5'-n-ethyl-carboxyamidoadensoine ( neca ) and l-n6-phenylisopropyladenosine ( l-pia ) , stimulated secretion to the same extent as adenosine and the effect of neca was antagonized by 8-phenyltheophylline , suggesting a p1 purinoceptor-mediated mechanism .
C0031484
l
C0001443
adenosine