Provided below are ELISA kits targeting proteasome 26S subunit, non-ATPase 4, a human protein encoded by PSMD4. This protein is 377 amino acids long, with a mass of 40.7 kDa, and is a member of the Proteasome subunit S5A family. 2 isoforms have been identified. Other alias names for this protein include: 26S proteasome non-ATPase regulatory subunit 4, 26S proteasome regulatory subunit S5A, S5a/antisecretory factor protein, angiocidin, multiubiquitin chain-binding protein, proteasome (prosome macropain) 26S subunit non-ATPase 4, and AF.