Anti-CEA cell adhesion molecule 3 antibodies are used for the immunodetection of the protein encoded by the CEACAM3 gene. In humans, the canonical protein has a reported length of 252 amino acid residues and a mass of 27.1 kDa. Its subcellular localization is in the membrane. Alternative splicing is reported to yield 3 different isoforms for this protein. A member of the CEA protein family, it is known to be involved with signal transduction pathways. Post-translational modifications have been described, including phosphorylation and glycosylation. Other names for this target antigen include CEA, W264, W282, carcinoembryonic antigen-related cell adhesion molecule 3, and CD66D. Gene orthologs have been identified in the mouse and chimpanzee species.