[Hyp3,Thr6]-bradykinin: Induces relaxation of rat smooth muscle from tail artery (EC(50)=56.7 nM) and contraction of that from ileum (EC(50)=588 nM), urinary bladder (EC(50)=4.6 uM) and uterus (EC(50)=3.9 nM). Binds to both bradykinin receptor B1 (BDKRB1) and B2 (BDKRB2). In arterial smooth muscle, the effect via BDKRB1 is stronger, in uterus, ileum and urinary bladder that via BDKRB2