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Effect of free sialic acids on LtxA-induced hemolysis. Human erythrocytes were incubated in the presence or absence of free sialic acid (N-acetylneuraminic acid) at 250 μM to 1 mM together with LtxA (15 μg ml−1) for 60 min at pH 7.4. The bars show mean ± SEM (n = 5).
