4 morphine ( 5 x 10 ( -6 ) m ) as well as the opioid peptides d-ala2 , n-phe4 , met- ( 0 ) -01 ( fk 33-824 ; 9 x 10 ( -7 ) m ) , d-met2-pro5 enkephalin ( 3 x 10 ( -7 ) m ) and d-ala2-d-leu5-enkephalin ( 5 x 10 ( -6 ) m ) inhibited the magnitude of the noncholinergic contracture but did not alter contractile responses to exogenous substance p ( 4 x 10 ( -11 ) m -- 4 x 10 ( -10 ) m ) .
C0205753
opioid peptides
C0014298
enkephalin