Abstract
Summary
1. The SSC factor was demonstrated to be in the gamma globulin fraction of rheumatoid serum precipitable by dilution with water. 2. The SA reaction required the presence of both the water insoluble fraction and supernate. The former was specific for rheumatoid serum, the latter was found to be a component of normal adult human serum. 3. Reciprocal absorption experiments would indicate that the SSC reaction and the SA reaction are due to separate constituents of the gamma globulin.
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