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The olfactory bulb (OB) is often affected at very early stages of neurodegenerative disorders, in the so‐called “prodromal” phase. In Parkinson's disease (PD), olfactory disturbances appear years before motor symptoms arise. Additionally, pathological alpha‐synuclein aggregates are found in olfactory regions before spreading to other areas of the brain. Being positioned at the frontier between the...
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