FMRFamides and FMRFamide-like peptides are neuropeptides. WANQVRF-amide inhibits the activity of dissected pharyngeal myogenic muscle system. Each flp gene is expressed in a distinct set of neurons. Flp-19 is expressed in the URX interneurons, the serotonin and acetylcholine-expressing HSN neurons, and the AIN, AWA and BAG neurons. Expressed from the comma stage of embryogenesis, during all larval stages, and in adults. Belongs to the FARP (FMRFamide related peptide) family.