Animal model:Thy1-αSyn (ASO) miceRelevant groups: (all ASO or WT mice)FMT: 1) GF+SPF-WT-FMT 2) GF+human PD-FMT 3) GF+human HC-FMTNo FMT: 4) GF 5) SPF 6) SPF+AB. Here, THY1 is linked to Parkinson disease.