Anti-Penumbra antibodies enable researchers to detect and measure the Penumbra antigen in biological samples. This target is a reported synonym of the TSPAN33 gene, which encodes tetraspanin 33. This protein is known to function in protein localization to the plasma membrane, among other biological roles. The human version of Penumbra has a canonical amino acid length of 283 residues and a protein mass of 31.5 kilodaltons. It is reported to be localized in the cell membrane and cytoplasm of cells and widely expressed in many tissue types. Penumbra is a member of the Tetraspanin (TM4SF) protein family. Indicated applications for Penumbra antibodies listed below include ELISA, Flow Cytometry, Western Blot, and Immunohistochemistry.