these findings , together with the similarity of the biological efficacy of n6- [ r- ( - ) -1-methyl-2-phenethyl ] adenosine and 5'-n-ethylcarboxamidoadenosine , suggest that the adenosine receptor present on myenteric nerve endings is unitary but do not permit its designation as an a1 or a2 subtype .
C0001443
adenosine
C0050789
5