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Bacteria produce several protein toxins that act inside cells. These toxins bind with high affinity to glycolipid or glycoprotein receptors present on the cell surface. Binding is followed by endocytosis and intracellular trafficking inside vesicles. <br /><br />Gangliosides, glycosphingolipids present in the membranes of neuronal and other cells, are natural receptors for a number of bacterial toxins and viruses whose sensitive detection is of interest in clinical medicine as well as in biological warfare or terrorism incidents.