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Methylotrophic yeast (Pichia pastoris) secreted cholera toxin B subunit (CTB) predominantly as a biologically active pentamer (PpCTB) with identical ganglioside binding affinity profiles to that of choleragenoid. Unlike choleragenoid, however, the PpCTB did not induce a footpad edema response in mice. Of the two potential glycosylation sites (NIT4–6 and NKT90–92) for this protein, a N-linked oligosaccharide...
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