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Comparison of TcdB residues involved in frizzled receptor binding. Tree alignment of TcdB sequences of strains VPI 10493, 1470 (reference TcdB variant strain), NAP9 (TcdB variant strain), 8864 (TcdB variant strain), NAP1v, R20291 (NAP1 reference strain), and NAP1. TcdBVPI was used as a reference. Discrepancies are highlighted with black bars or colored-residue letters.
