Plasma membrane transporter mediating the uptake by cells of the water soluble vitamin B2/riboflavin that plays a key role in biochemical oxidation-reduction reactions of the carbohydrate, lipid, and amino acid metabolism ( , ). Humans are unable to synthesize vitamin B2/riboflavin and must obtain it via intestinal absorption .
Subcellular locations: Apical cell membrane, Cell membrane
Subcellular locations: Cell membrane, Nucleus membrane, Cytoplasm
Subcellular locations: Cytoplasm
Predominantly expressed in testis. Highly expressed in small intestine and prostate.