Abstract
Summary and Conclusions
Toxic material, which causes death of mice on intravenous injection, can be extracted from progestational endometrium and from placenta of several mammalian species. Small amounts of material with a similar effect are present in extracts of skeletal muscle. Quantitative estimation of the toxicity of a variety of tissue extracts has been made. Addition of blood or serum rapidly diminishes this toxic property.
Special appreciation is due Miss Carol Spaulding for assistance in conducting this investigation.
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