FMRFamides and FMRFamide-like peptides are neuropeptides. GAKFIRF-amide has an excitatory effect on dissected pharyngeal myogenic muscle system. Each flp gene is expressed in a distinct set of neurons. Flp-5 is expressed in the ASE sensory neurons, the 14 and M4 cholinergic pharyngeal motoneurons, and the PVT and RMG neurons. It is weakly expressed in the PB and 12 neurons. Also expressed in pharyngeal muscle. Expressed from the comma stage of embryogenesis, during all larval stages, and in adults. Belongs to the FARP (FMRFamide related peptide) family. Extended N-terminus.