The neuroactive peptide Phe-Met-Arg-Phe-NH2 (FMRF-amide) has a variety of effects on both mammalian and invertebrate tissues [1].

1: Aplysia neurons express a gene encoding multiple FMRFamide neuropeptides. Schaefer M, Picciotto MR, Kreiner T, Kaldany RR, Taussig R, Scheller RH; Cell 1985;41:457-467. PMID:3838698

2: Isolation and characterization of a Drosophila neuropeptide gene. Nambu JR, Murphy-Erdosh C, Andrews PC, Feistner GJ, Scheller RH; Neuron 1988;1:55-61. PMID:3272155