Anti-CASTOR1 antibodies are used in the immunodetection of the protein cytosolic arginine sensor for mTORC1 subunit 1. In humans, the canonical protein has a reported length of 329 amino acid residues and a mass of 36.3 kDa. Its subcellular localization is in the cytoplasm. It is widely expressed across many tissue types. A member of the GATS protein family, CASTOR1 is known to function as a intracellular arginine sensor within the amino acid-sensing branch of the TORC1 signaling pathway. Post-translational modifications have been described, including ubiquitination and phosphorylation. Synonyms for this target antigen include GATS-like protein 3, cellular arginine sensor for mTORC1 protein 1, and GATS protein like 3. CASTOR1 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. Some CASTOR1 antibodies may have been used in research and have associated citations. These antibodies are most commonly used in Western Blot experiments, among other applications.