YscM2 (green ribbon), a negative regulator of type III secretion in Yersinia enterocolitica, binds to the homodimeric secretion chaperone SycH (molecular surface rendering showing the distribution of electrostatic potential) in a manner that is very similar to the way in which the bacterial cytotoxin YopE (yellow ribbon) interacts with its cognate secretion chaperone SycE (not shown).

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