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Neurotransmitter transporters are the target of various pharmacological agents used to treat psychological or cognitive conditions, such as depression and attention-deficit disorder. In addition, some of the effects of stimulant-type drugs of abuse result from inhibition of neurotransmitter transporters. Robinson describes the intersection between neurotransmitter transporters and signaling pathways. Neurotransmitter transporters can be regulated by altering the rate of internalization and insertion into the plasma membrane to control cell surface expression or by altering the activity of the transporters within the membrane. As the mechanisms governing regulation of these transporters become elucidated, new potential therapeutic targets may be revealed, given the many processes affected by the activity of neurotransmitter transporters.