Abstract
Summary By the use of the continuous-flow hangingcurtain electrophoresis apparatus developed by Karler, it has been possible to purify the murine toxin of Pasteurella pestis to such an extent that the final preparation exhibited only 1 band in the very sensitive gel precipitation techniques of Oudin and Ouchterlony. The final product had an intraperitoneal LD50 of 0.7μg for 16 to 20-g mice, and an intravenous LD50 of 0.2μg. Experiments are described which suggest that even this relatively pure toxin molecule may still contain portions which are not necessary for toxicity.
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