SNCA and neurodegenerative disease: In addition, small amounts of this gas inhibit the formation of abnormal amyloid compounds of alpha-synuclein (Hou et al., 2017), tau (Giovinazzo et al., 2021), and beta-amyloid (Rosario-Alomar et al., 2015) and helps keep at bay neurodegenerative disease (Hou et al., 2017; Paul and Snyder, 2018; Munoz-Pinto et al., 2021; Paul, 2021).