Transue T R, Smith A K, Mo H, Goldstein I J, Saper M A
Nat Struct Biol. 1997 Oct;4(10):779-83. doi: 10.1038/nsb1097-779.
Amaranthus caudatus agglutinin contains a novel arrangement of four beta-trefoil domains. The sugar-binding site provides specificity for the carcinoma-associated T-antigen disaccharide even when 'masked' by other sugars.