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Comparative analysis of the efficacies of GXM samples in the induction of NO production by macrophages. Polysaccharide fractions from strain CN23/10993 were significantly more efficient at inducing NO production than all others (P < 0.0001) at 1, 10, and 100 μg/ml. LPS was used as a positive control for NO production by macrophage-like cells; incubation of the phagocytes in the medium alone (no stimulation) was the negative control. Serotypes are given in parentheses for each strain.
