MAPT and amyotrophic lateral sclerosis: The family of prion-like proteins is growing and includes now a-beta (AD), tau (tauopathies), α-synuclein (PD), and SOD in amyotrophic lateral sclerosis (ALS) and often using the term prion for these proteins (e.g., tau prions) (Marciniuk et al. 2013).