Sodium/ascorbate cotransporter (PubMed:10331392). Mediates electrogenic uptake of vitamin C, with a stoichiometry of 2 Na(+) for each ascorbate (By similarity). L-ascorbate(out) + 2 Na(+)(out) = L-ascorbate(in) + 2 Na(+)(in) Highly expressed in the straight segment of proximal tubules in the kidney, in intestine and liver. Detected in epithelial cells of the bronchiole and epididymis. Phosphorylated. Belongs to the nucleobase:cation symporter-2 (NCS2) (TC 2.A.40) family.