Receptors, NeuropeptideReceptors, Neuropeptide YNeuropeptidesNeuropeptide YSubstance PCaenorhabditis elegansFMRFamideCalcitonin Gene-Related PeptideVasoactive Intestinal PeptideGalaninHypothalamusInvertebrate HormonesTachykininsAgouti-Related ProteinPituitary Adenylate Cyclase-Activating PolypeptideNeurosecretory SystemsPyrrolidonecarboxylic AcidHypothalamic HormonesArcuate NucleusSomatostatinBrachyuraPro-OpiomelanocortinPeptide YYNeurotransmitter AgentsNeurokinin ASecretogranin IINeurons