This research mapped out where in the nervous system of Biomphalaria glabrata (a freshwater snail that spreads schistosomiasis) the neuropeptides Cholecystokinin (CCK) / Sulfakinin are located. Using immunohistochemistry and mRNA labeling, they found that both the peptide itself and the mRNA encoding it are expressed in clusters of neurons within the snail’s central nervous system; the mRNA was seen mainly in neuron cell bodies, while the peptide is also found in neuronal fibers. Because CCK/Sulfakinin is known in other animals to regulate feeding, digestion, and possibly immune responses, knowing where these neuropeptides are in B. glabrata could help us understand how infection affects snail behavior or physiology, which may be relevant in efforts to control schistosomiasis.