Equilibrative nucleoside transporter 4 is a protein that in humans is encoded by the SLC29A4gene.
This gene is a member of the SLC29 family and encodes a plasma membrane protein with 11 transmembrane helices. This protein catalyzes the reuptake of monoamines into presynaptic neurons, thus determining the intensity and duration of monoamine neural signaling. It has been shown to transport several compounds, including serotonin, dopamine, and the neurotoxin 1-methyl-4-phenylpyridinium. Alternate transcriptional splice variants which encode the same protein have been characterized.
Bottalico B, Noskova V, Pilka R, et al. (2007). "The organic cation transporters (OCT1, OCT2, EMT) and the plasma membrane monoamine transporter (PMAT) show differential distribution and cyclic expression pattern in human endometrium and early pregnancy decidua". Mol. Reprod. Dev.74 (10): 1303–11. doi:10.1002/mrd.20697. PMID17393420.