Virginia Tech Sep 2 2025 Researchers have identified a neurochemical signature that sets Parkinson's disease apart from essential tremor - two of the most common movement disorders, but each linked to distinct changes in the brain. In a new study in Nature Communications , scientists from the Fralin Biomedical Research Institute at VTC and the Virginia Tech College of Science identified unique chemical signaling patterns of two key neurotransmitters - dopamine and serotonin - that distinguish