Transporter for alanine, serine, cysteine, and threonine. Exhibits sodium dependence. Expressed mostly in brain, muscle, and pancreas but detected in all tissues examined. Belongs to the sodium:dicarboxylate (SDF) symporter (TC 2.A.23) family. SLC1A4 subfamily. 2 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: Membrane protein, integral; Membrane protein, multi-pass; Transporter; Transporter, SLC family