658330805ENSG00000197208ENSMUSG00000020334Q9H015Q9Z306NM_003059NM_019687NM_001330304NP_003050NP_001317233NP_062661Solute carrier family 22, member 4, also known as SLC22A4, is a human gene; the encoded protein is known as the ergothioneine transporter.

The first functional designation of this protein was OCTN1 ("organic cation transporter, novel, type 1"), but efficiency of transport for organic cations (e.g., tetraethylammonium) is very low.

Instead, the protein is responsible for the cotransport of sodium ions and ergothioneine, which is an antioxidant, into cells.

[7] Thus, a more appropriate functional designation is ETT ("ergothioneine transporter").

[8] This article incorporates text from the United States National Library of Medicine, which is in the public domain.