in contrast , only 13 out of 24 indomethacin-treated vessels contracted in response to bradykinin , which had only one tenth and one 160th the potency ( ed50 = 9.9 +/- 1.8 x 10 ( -7 ) m ) of des-arg9-bradykinin and des-arg10-kallidin , respectively .
C0006100
bradykinin
C0022474
kallidin