SLC6A4 and attention deficit-hyperactivity disorder: Of pronounced interest to neuropharmacology is the subclass of monoamine transporters (MATs), including the dopamine transporter (DAT), the norepinephrine transporter (NET), and the serotonin transporter (SERT), which are molecular targets for a range of psychopharmaceuticals, including drugs against depression, anxiety, neuropathic pain, attention-deficit hyperactivity disorder (ADHD), and narcolepsy (Kristensen et al., 2011; Aggarwal and Mortensen, 2017).