| Modification Notes |
Solute carrier family 22 member 9 (SLC22A9), also known as Organic anion transporter 4 (OAT4), is a 553 amino acid member of the organic cation transporter family of proteins. Members of the SLC22 family mediate anion transport primarily and are expressed primarily in liver and kidney. SLC22A9, a multi-pass membrane protein, is the only protein in the family that is expressed also in placenta. SLC22A9 has been shown to transport certain organic anions and other members of the SLC22 family, however, fewer numbers of substrates have been identified for SLC22A9, suggesting that it may have greater specificity than the other members of the family. Two isoforms of SLC22A9 exist as a result of alternative splicing events. |