FMRF, a neuropeptide, is primarily studied in neuroscience and biological research due to its role in modulating neuronal activity. It is often used in experiments to understand the regulation of heart rate and muscle contraction in invertebrates, serving as a model for studying neuropeptide functions. Additionally, FMRF is utilized in electrophysiological studies to investigate its effects on ion channels and synaptic transmission, providing insights into neural signaling pathways. Its applications also extend to behavioral studies, where it helps elucidate the influence of neuropeptides on feeding, locomotion, and other physiological processes in model organisms.