Secretin (33-59), rat, is primarily used in research settings to study the physiological roles of secretin and its receptor in the gastrointestinal and central nervous systems. It is often employed in animal models to investigate its effects on pancreatic secretion, gastric acid regulation, and water homeostasis. Researchers also utilize it to explore its potential therapeutic applications in conditions like autism spectrum disorders, where secretin has been hypothesized to play a role. Additionally, it aids in understanding the molecular mechanisms of secretin-related signaling pathways and their impact on digestive and neurological functions.