Anti-alien antibodies enable researchers to detect and measure the alien antigen in biological samples. This target is a reported synonym of the COPS2 gene, which encodes COP9 signalosome subunit 2. This protein is known to function in the regulation of transcription and the regulation of cell differentiation, among other biological roles. The human version of alien has a canonical amino acid length of 443 residues and a protein mass of 51.6 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the nucleus and cytoplasm of cells and widely expressed in many tissue types. This target antigen may also be known as CSN2. Western Blot is a widely used application for the alien antibodies listed below. In addition, ELISA is also a common application.