The ability of bacterial lipopolysaccharides to inactivate C'3 may, therefore, prove to be a useful test for evaluating the purity of lipopoly- saccharides, or at least their freedom from certain cellular materials. The appearance of high molecular weight substances in serum following injection of small amounts of endotoxin is a highly significant, but unex- pected, addition to an already complex system.
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Elevation of properdin levels in mice following administration of bacterial lipopolysaccharides.
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