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The contribution of N-terminal regions of staphylococcal bi-component γ-hemolysin toxin components to hemolytic activity toward human erythrocyte cells was investigated in this study. A deletion construct of N-terminal amino acids 1-10 of Hlg2 (Hlg2 ΔN1, which is the S-component protein of γ-hemolysin, had little effect on its hemolytic activity, whereas N-terminal 1-11 amino acid deletion (Hlg2 ΔN11) significantly delayed hemolysis. Moreover, a deletion of N-terminal amino acids 1-17 of LukF, which is the F-component protein of γ-he