A peptide agonist of PAR4; induces aggregation of rat and human platelets in vitro (EC50s = 15 and 60 μM, respectively); induces relaxation of isolated rat aortic rings and contraction of rat gastric longitudinal muscle strips (EC50s = 11 and 110 μM, respectively); inhibits calcium mobilization evoked by capsaicin in rat sensory neurons; increases latency to paw withdrawal and nociceptive threshold in response to thermal and mechanical stimuli