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The response of E. histolytica to a stimulating principle present in dead bacterial cells has been shown to be proportional to the amount added. The factor is rather labile to heat, to alkali, and to oxidation, but stable in presence of formaldehyde. There are some indications that it may be a labile metabolic intermediate.
1 Supported in part by the Abbott Laboratories, North Chicago, Illinois, and the National Institutes of Health, Bethesda, Maryland.
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