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Amaranthus caudatus agglutinin or amaranthin is a lectin from the ancient South American crop, amaranth grain. Although its biological function is unknown, it has a high binding specificity for the methyl-glycoside of the T-antigen, found linked to serine or threonine residues of cell surface glycoproteins. The protein is comprised of a homodimer, with each homodimer consisting of two beta-trefoil domains.
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