TNFRSF1A and Parkinson disease: Figure 1F shows that the ratio of membrane protein and total protein for IL-1R, IL-6R, and TNFR1 was 1.48 ± 0.15, 1.59 ± 0.18, and 1.67 ± 0.16 in PAG of PD rats (P < 0.05 vs. their respective controls).