Anti-CPN4 antibodies are used in antigen-specific immunodetection in biological samples. The target CPN4 is a known alias name of the protein copine 4, encoded by the CPNE4 gene in humans. This 557-amino acid residue protein is a suspected calcium-dependent phospholipid-binding protein that may play a role in calcium-mediated intracellular processes. In terms of tissue expression, it is widely expressed across many tissue types.