$BNGO look at the wording at the end "This is a rich vein we have just begun to tap." Another variant was found in a gene called MAD1L1. Variants of this gene have previously been linked to bipolar disorder, post-traumatic stress disorder and schizophrenia. According to co-lead author Daniel Levey, a postdoctoral associate at Yale, "One of the goals of this research is to find important risk genes that are associated with risk for many psychiatric and behavioral traits for which we don't have a good explanation." Gelernter added, "This is a rich vein we have just begun to tap."