These HAD ELISA kits are immunodetection tools for measuring the levels of HAD in biological samples. HAD is an alias name of the human HADH gene, which encodes the protein, hydroxyacyl-CoA dehydrogenase. Notably, HAD is known to play a role in the response to xenobiotic compounds, among other functions. The HADH protein is 314 amino acid residues in length and 34.3 kilodaltons in mass. However, as many as 3 protein isoforms have been identified. It is localized to the mitochondria of the cell. In terms of tissue specificity, it is reported to be expressed in liver, kidney, pancreas, heart and skeletal muscle. Other names for this target antigen include .