Lectins can be classified into seven families of structurally and carbohydrate-binding proteins, including (1) the amaranthins, (2) the cucurbitaceae phloem lectins, (3) the chitin binding lectins composed of hevein domains, (4) the GNA-related lectins, (5) the jacalin-related lectins, (6) the legume lectins and (7) the lectins with ricin-B domains