Jacalin is a plant based lectin, found in jackfruit. It has been studied for capturing O-glycoproteins such as mucins and IgA1, for potential applications in human immunology. Jacalin has a tetrameric two-chain structure with a weight of 66 kDa. with two non-covalently bound subunits at 14.6 and 17.1 kDa. Jacalin is preferably used in applications to isolate IgA from human serum, isolating human plasma glycoproteins and for applications in histochemistry.