1 in in vitro experiments adenosine 5'-triphosphate ( atp ) and adenosine were found to exert different effects on the guinea-pig isolated trachea depending on whether the trachea had previously been contracted with acetylcholine ( ach ) ( 6.6 x 10 ( -6 ) m ) or was at resting tone .
C0001480
adenosine 5
C0001443
adenosine