function:Acts as a multispecific organic anion pump which can transport nucleotide analogs.,similarity:Belongs to the ABC transporter family.,similarity:Belongs to the ABC transporter family. Conjugate transporter (TC 3.A.1.208) subfamily.,similarity:Contains 2 ABC transmembrane type-1 domains.,similarity:Contains 2 ABC transporter domains.,
Basolateral cell membrane ; Multi-pass membrane protein . Golgi apparatus lumen . Endosome membrane . Cytoplasmic granule . Apical cell membrane ; Multi-pass membrane protein . In most cells, routes to the basolateral plasma membrane, but in the brain capillary endothelial cells that form the blood-brain barrier, resides in the apical membrane. .
[Isoform 3]: Predominant isoform in retinal pigment epithelium, bladder, and stomach. ; Ubiquitously expressed, but levels in brain and muscle are especially high (PubMed:9827529, PubMed:10438534, PubMed:15501592). All isoforms are equally expressed in retina (PubMed:17521428).
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