Anti-ARCN1 antibodies are used in the immunodetection of the protein archain 1. In humans, the canonical protein has a reported length of 511 amino acid residues and a mass of 57.2 kDa. Its subcellular localization is in the membrane, cytoplasmic vesicles, golgi, and cytoplasm. Alternative splicing is reported to yield 2 different isoforms for this protein. It is ubiquitously expressed across many tissue types. A member of a the Adaptor complexes medium subunit protein family, ARCN1 is a known component of the coatomer, a cytosolic protein complex that binds to dilysine motifs and reversibly associates with Golgi non-clathrin-coated vesicles, which further mediate biosynthetic protein transport from the ER, via the Golgi up to the trans Golgi network. Synonyms for this target antigen include SRMMD, SSMG, coatomer subunit delta, COPI coat complex subunit delta, archain vesicle transport protein 1, and COPD.