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Biological activity in the Limulus test system. The activities (in EUs) of LPS R60 and LPS/Pep19-2.5 mixtures in the Limulus amebocyte lysate test at three different LPS concentrations and LPS/Pep ratios of 1:1–1:30 weight % are shown. As the standard in this test, the LPS S-form from E. coli O111 is used; 1 ng of LPS corresponds to 14.6 EUs.
