The E4 ELISA kits listed below are analytical tools for measuring concentrations of E4 in various samples. E4 is an alternative name for the human UBE4A gene, which encodes the protein, ubiquitination factor E4A. It has been mentioned that E4 plays a role in protein ubiquitination, among other functions. Structurally, the UBE4A protein is 1066 amino acid residues in length and 122.6 kilodaltons in mass. However, as many as 2 protein isoforms have been identified. It is localized to the cytoplasm of the cell. Other names for this target antigen include NEDHMS and UBOX2. Click on the following ELISA kits for more detailed information, including target reactivity and assay sensitivity.