This peptide activates mouse sensory neuron-specific G-protein coupled receptors MRGPRX1, but not human receptors (PubMed:30243794). In vivo, causes hyperactivity in mice when injected intracranially (PubMed:11738233). Expressed by the venom duct. The mature peptide does not contain cysteine residue. Belongs to the FARP (FMRFamide related peptide) family.