the effects of the adenosine analogs , l-n6-phenylisopropyladenosine ( l-pia , 100 pm to 1 microm ) , d-pia ( 100 nm to 100 microm ) , and 5'-n-ethylcarboxamidoadenosine ( neca , 10nm to 100 microm ) , were tested on spontaneous transmitter release at the frog neuromuscular junction .
C0001443
adenosine
C0050789
neca