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 A new study finds proof that Parkinson’s disease begins in the gut. After injecting specific proteins into the guts of mice, the manifestations of Parkinson’s were observed a month later. The mouse model showed how a protein (alpha synuclein) can travel from the gut to the brain via the vagus nerve and resulted in Parkinson’s symptoms rarely seen in previous animal studies. Neuron Takeaway: While this study acts as the first proof of Parkinson’s gut origin, the hypothesis has been around since 2003 and was originally presented by Dr. Heiko Braak. Scientists are now hoping to conduct studies that uncover how and why this process begins in the first place.