FMRFamides and FMRFamide-like peptides are neuropeptides. KSAYMRF-amide has an excitatory effect on dissected pharyngeal myogenic muscle system. Each flp gene is expressed in a distinct set of neurons. Flp-6 is expressed in the ASE sensory neurons, AFD, ASG, PVT and I1 neurons. Expressed from the comma stage of embryogenesis, during all larval stages, and in adults. Belongs to the FARP (FMRFamide related peptide) family.