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Vibrio vulnificus secretes a hemolysin/cytolysin (VVH) that induces cytolysis against a variety of mammalian cells by forming pores on the cellular membrane. VVH is known to bind to the cellular membrane as a monomer, and then convert to a pore-forming oligomer. However, the structural basis for binding of this toxin to target cells remains unknown. We show here that the polarity and indole ring on...