SLC1A3 and attention deficit-hyperactivity disorder: At the 5p13 SNP cluster, the nearest gene is SLC1A3, a brain expressed glutamate transporter which has been implicated in some behavioral phenotypes, e.g., attention deficit hyperactivity disorder, mood disorders, cortico-limbic connectivity during affective regulation (Huang et al., 2019; Medina et al., 2016; Poletti et al., 2018; van Amen-Hellebrekers et al., 2016).