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The B-subunit of Shiga toxin has been demonstrated as a powerful vector for carrying attached peptides into cells for intracellular transport studies and for medical research. We have investigated the structure of the B-subunit and of a chimera bearing a peptide extension, bound to the membranous lipidic receptor, the globotriaosylceramide (Gb3). Two-dimensional crystals of both B-subunits have been...