Lectin

any of a group of glycoproteins of primarily plant (usually seed) origin that binds to glycoproteins on the surface of cells causing agglutination, precipitation, or other phenomena resembling the action of specific antibody =Description== Lectins include plant agglutinins (phytoagglutinins, phytohemagglutinins), plant precipitins, and perhaps certain animal proteins; some have mitogenic properties and induce lymphocyte transformation.