Sodium- and chloride-dependent glycine transporter which is essential for regulating glycine concentrations at inhibitory glycinergic synapses. chloride(out) + glycine(out) + 2 Na(+)(out) = chloride(in) + glycine(in) + 2 Na(+)(in) First expressed in early tailbud stage embryos in the midbrain and anterior spinal cord, and weakly in the hindbrain. By late tailbud stages, expression extends posteriorly in the spinal cord to appear in between somites. Expressed in the forebrain, retina, between the somites and in the blood islands by the swimming tadpole stages. Belongs to the sodium:neurotransmitter symporter (SNF) (TC 2.A.22) family. SLC6A9 subfamily.