The function of Ensembl gene identifier ENSG00000180773 (SLC36A4, solute carrier family 36 member 4) is as follows. Uniporter that mediates the transport of neutral amino acids like L-tryptophan, proline and alanine (PubMed:21097500). The transport activity is sodium ions-independent, electroneutral and therefore functions via facilitated diffusion (PubMed:21097500). .