FMRFamide-like neuropeptides (PubMed:15809090, PubMed:24533288). Involved in mediating arousal from the sleep-like state called lethargus, which occurs during molting between larval and adult stages, in part by regulating touch sensitivity, and working in concert with neuropeptide pdf-1 (PubMed:27585848). Involved in neural modulation of systemic mitochondrial unfolded protein response (PubMed:27767096). Acts as a ligand to FMRFamide peptide receptor frpr-18 in vitro. Acts as a ligand to FMRFamide peptide receptor frpr-18 in vitro. Knockouts generated by CRISPR-Cas9-mediated gene editing strongly inhibited the peripheral induction of the mitochondrial unfolded protein response.