Sodium:Neurotransmitter Symporter (NSS) is a membrane protein that clears neurotransmitters from the synapse by co-transporting them back into the neuron, using the energy from the sodium ((Na^{+})) gradient; key examples include transporters for dopamine (DAT), serotonin (SERT), and norepinephrine (NET), GABA, and glycine and are targets for antidepressants and stimulants. Used as building blocks of Multi-target drug ligand MTDL