SNCA and Parkinson disease: Wassef et al. [194], who performed studies in transgenic Drosophila melanogaster flies overexpressing α-synuclein and methionine sulfoxide reductase (MSRA), observed that dietary supplementation with S-methyl-L-cysteine was able to prevent or alleviate the symptoms of PD since it participates in the antioxidant mechanism of MSRA, inducing an increase in enzyme activity.