Clone PAM-F101 is a unique monoclonal antibody developed against porcine α-2-Macroglobulin. α-2-Macroglobulin (α2M) is a broad spectrum proteinase inhibitor synthesized mainly by hepatocytes, and locally by macrophages. The inhibitory mode of action uses a capturing mechanism through a peptide sequence (“bait region”) which contains specific cleavage sites for different proteinases. When a proteinase cleaves the bait region, a conformational change and concomitant thioester bond hydrolysis is induced, leading to covalent binding of α2M to the proteinase. The bound enzyme remains active against low molecular weight substrates while the activity against high molecular weight substrates is reduced. The proteinase-α2M complex is recognized by macrophage receptors and cleared from the system