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Volume 193, no. 22, p. 6375–6378, 2011, https://doi.org/10.1128/JB.05949-11. There were errors in the construction of Fig. 2A and C, where the incorrect panels were used to represent K279a, K279a + AX21, raxH + AX21, and ax21 (p0387Y22A). We apologize for these errors and retract this paper due to this data misrepresentation.
