Pyroglutamylated RFamide peptide receptor Rhodopsin-like receptors RFamide peptide family RFamide peptide family QRFP Neuropeptide VF precursor Pyroglutamylated RFamide peptide receptor Clava multicornis Gonadotropin-inhibitory hormone Neuropeptide FF receptor 1 CNF-Sr3 Neuropeptide FF FMRFamide Erin M. Gibson Prolactin-releasing peptide Planulozoa Rhodopsin-like receptors Cnidocyte Kisspeptin Trichoplax Placozoa Pain in amphibians Neurotransmitter