a, GAT. Red: sympathetic nerve fibres (TH). Green: endothelial cells (CD31). Scale bar: 300μm. b, GAT ILC2-derived Met-Enk after 6-OHDA administration. n=5. c, CD4 T cells and TH positive CD4 T cells after 6-OHDA administration. n=4. d,e, Distance covered by mice in the open field test n=3. Scale bar=10cm. f, GAT ILC2-derived Met-Enk after Clenbuterol administration. n=5. g, Heatmap of Adrb1, Adrb2, and Adrb3, read counts (FPKM) on ILC2s, n=4. h, GAT ILC2 after CNO administration. R26/3Dfl n=4, R26Th n=4, and R26/3DTh n=5. i, Heatmap of Adrb1, Adrb2, and Adrb3, read counts (TPM) on MSCs, n=4. j, Gdnf expression after in vitro stimulation of MSCs, n=3. Data are representative of 3 independent experiments. n represents biologically independent animals. Data are presented as mean values and error bars: SEM. Two-tailed unpaired Welch's t-test. *P<0.05; ***P<0.005.