2 atp and adenosine ( 10 ( -5 ) and 10 ( -3 ) m ) were equipotent in relaxing the precontracted guinea-pig trachea , since concentrations of 1.09 +/- 0.35 and 0.39 +/- 0.16 mm respectively reduced by 25 % the ach-induced contraction .
C0001480
atp
C0001443
adenosine