In larvae, both sNPF-1 and sNPF-1(4-11) are expressed in the CNS and ring gland but not the midgut or thoracic perisympathetic organs (tPSO) and abdominal perisympathetic organs (aPSO) (at protein level). In adults, both sNPF-1 and sNPF-1(4-11) are expressed in brain, cardiaca, corpora allata and thoracic-abdominal ganglion (at protein level). Detected in larvae and adults. Belongs to the NPY family.