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Comparative activities of TX-114 extracts of virulent versus avirulent M. arthritidis strains. The detergent phases from TX-114 extraction of avirulent strain 158, MAV-1-infected 158L3-1a, and highly virulent 158p10p9 were compared in a dose-response experiment for TNF-α production by RAW 264.7 cells. Results are expressed as means ± SEM (see text for P values). Three different preparations of strains 158 and 158p10p9 and two of 158L3-1a were tested with similar results.
