TGFB2 and amyotrophic lateral sclerosis: Within the MC and the OL, the TGF-β1 and -2 protein levels of ALS patients and healthy controls were comparable (TGF-β1(MC): p = 0.392; (OL): p = 0.299; Figure 5C/TGF-β2 (MC): p = 0.103; (OL): p = 0.993; Figure 5D).