May be directly involved in a paralyzing effect, by inhibiting muscle contraction, or may also act centrally to modulate prey behaviors (Probable). Inhibits both the frequency and amplitude of spontaneous contractions of the locust oviducts (tested at 50 nM) (Ref.2). Does not produce consistent and reproducible effects on ASIC currents (PubMed:31658776). Inhibits spontaneous oviduct contractions to the same extent as that of SchistoFLRFamide (Probable). Expressed by the venom gland. Both the long peptide (Sh5a) and the short peptide (Sh5b) (residue 2-10) are amidated. Sh5a, Monoisotopic mass. Sh5b, Monoisotopic mass. Belongs to the FARP (FMRFamide related peptide) family.