Anti-alpha1AT antibodies enable researchers to detect and measure the alpha1AT antigen in biological samples. This target is a reported synonym of the SERPINA1 gene, which encodes serpin family A member 1. This protein is known as an inhibitor of serine proteases. The human version of alpha1AT has a canonical amino acid length of 418 residues and a protein mass of 46.7 kilodaltons, although 3 isoforms have been identified. It is reported to be localized in the ER, extracellular matrix, and is secreted of cells and notably expressed in the small intestine, rectum, lung, kidney, and duodenum. Other names for this target antigen include A1A, A1AT, and AAT. Western Blot is a widely used application for the alpha1AT antibodies listed below. In addition, ELISA is also a common application.