HTT and Parkinson disease: Identification of other proteins soon followed; Fused in Sarcoma (FUS) and TAR DNA-binding protein-43 (TDP-43), both linked to amyotrophic lateral sclerosis (ALS), α-Synuclein (αSyn) in Parkinson’s disease (PD), multiple systemic atrophy (MSA) and Lewy body dementia (LBD), and huntingtin protein in Huntington disease, among many others.