Parasitic worms come from two very different phyla—Platyhelminthes (flatworms) and
Nematoda (roundworms). Although both phyla possess nervous systems with highly
developed peptidergic components, there are key differences in the structure and action of
native neuropeptides in the two groups. For example, the most abundant neuropeptide
known in platyhelminths is the pancreatic polypeptide-like neuropeptide F, whereas the
most prevalent neuropeptides in nematodes are FMRFamide-related peptides (FaRPs) …