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Department of Biochemistry, the Chicago Medical School, Chicago, Illinois
Abstract
A highly active allergenic material has been obtained by the fractionation of dwarf ragweed pollen extracts. The material isolated gives a single line on the Ouchterlony test. It gives skin reactions at concentrations corresponding to 10-5 µg N/ml. The immunologic relationship between this product and Trifidin A is demonstrated.
Footnotes
This research was supported by Grant E-1446 from the Institute of Allergy and Infectious Diseases of the National Institutes of Health.
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