Hsien-Hsien Lei reports that three companies, Neuromark, Psynomics, and SureGene, are now offering genetic tests for mental illness variants. Neuromark’s Mark-C test will test for markers GRIK2 and GRIA3, which are believed to increase the risk of suicidal thoughts in people on Celexa. Psynome tests for two mutations in the GRK3 gene associated with bipolar disorder. SureGene's AssureGene test will look at genes associated with patients at risk of developing psychosis.

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