Anti-RAB3A antibodies are used in the immunodetection of the protein RAB3A, member RAS oncogene family. In humans, the canonical protein has a reported length of 220 amino acid residues and a mass of 25 kDa. Its subcellular localization is in the cell membrane, cytoplasmic vesicles, lysosomes and cytoplasm. It is notably expressed in the brain. A member of a the Rab protein family, RAB3A is reported to be a small GTP-binding protein that plays a central role in regulated exocytosis and secretion. Post-translational modifications have been described, including phosphorylation. Synonyms for this target antigen include ras-related protein Rab-3A and RAS-associated protein RAB3A.