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Lipopolysaccharide (LPS)-induced release of cytokines from human monocytes can be prevented by previous interference of serum with LPS. This inactivation is a function of lipoproteins. Here we show that low-density lipoproteins as well as high-density lipoproteins can inactivate LPS. The effects of heparin and EDTA on LPS inactivation by serum are also described.
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