4TSS:
reference: Refined structures of three crystal forms of toxic shock syndrome toxin-1 and of a tetramutant with reduced activity., Prasad GS, Radhakrishnan R, Mitchell DT, Earhart CA, Dinges MM, Cook WJ, Schlievert PM, Ohlendorf DH, Protein Sci 1997 Jun;6(6):1220-7. PMID: 9194182

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