The tertiary structure of GNA (left top). Twelve strands of b-sheet associate in three four standed bundles and form the b-prism fold. Each standed bundle is one functional domain which is specific for agglutination and carbohydrate binding box. The deduced tertiary structure of ZCA (right below) strongly resembles that of GNA, therefore it is persumed that ZCA has similar functions with GNA in anti-viral and anti-insect properties. See pages 223-231 for more details.