inputs: hypothesis: University of Sydney is not far from the University of Oxford. premise: Researchers from the University of Sydney, University of Oxford, and University of Cambridge have pinpointed a single neurochemical - serotonin - as the cause of an instinctive behavioural change from the locusts' solitarious phase to become gregarious and form disastrous swarms of millions. Serotonin (5-hydroxytryptamine, or 5-HT) is a monoamine neurotransmitter synthesized in serotonergic neurons in the central nervous system (CNS) and enterochromaffin cells in the gastrointestinal tract of animals including humans. Serotonin is also found in many mushrooms and plants, including fruits and vegetables.