Reply to: “What Does α-Syn-SAA-Negative Parkinson's Disease Reveal about the Proposed “Biological Definition” of Parkinson's Disease?”2026-08-050 PRE AI SSarah M. Brooker KKenneth Marek MD KKathleen L. Poston * DOI:10.1002/mds.70438OriginalOriginal request for helpShareSaveAbstract En