Antispasmodics: Substituted ^-Xbnylhydroxyacetic Acids and Esters was immunologically distinct from other antigens present in castor beans was shown by the Schultz-Dale uterine strip method.Positive passive transfer reactions were pro-duced with 1 X 10"10 g. of CB-1A. Positive cutaneous tests, on castor bean hypersensitive subjects, were obtained with CB-1A diluted 1:106.
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