We all know the skin as the largest organ in our body - it protects us, regulates temperature and enables touch. But did you know that the skin can now also provide insights into the interior of our nervous system? Boston researchers have found that a protein called phosphorylated alpha-synuclein, which plays a key role in Parkinson's disease and other neurodegenerative diseases, can also be detected in the skin. This exciting discovery opens new avenues for diagnosing Parkinson's and related diseases.