Using a co-expression search tool, the two genes most co-expressed with RIT2 were carbonic anhydrase 10 (CA10) and SYT4. Of the 97 brain datasets that excluded cancer studies, based on co-expression, the most relevant dataset was a study of Parkinson’s disease [GSE20146, (Zheng et al., 2010)]. This evidence concerns the gene SYT4 and Parkinson disease.