SLC6A4 and Anxiety: Pearson bivariate correlations tests were conducted between the behavioral tests in adult males and females and the expression of mRNA serotonergic and ECB targets (htr1a, slc6a4, cnr1, cnr2 and faah; Table 3) in the mPFC to explore the association between the anxiety- and depressive-like phenotype of the rats and mRNAs expression.