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Protein-protein interaction of TcpC and TcpH in the bacterial two-hybrid system. Bacterial two-hybrid analysis and β-galactosidase assays were performed as described for Fig. 3. The dashed line represents the highest level of β-galactosidase activity from the negative controls. Statistical analysis was carried out using the Student's t test after analysis of variance, as indicated by an asterisk (P < 0.05 compared to results for the negative control).
