Observations on a Precipitin Reaction Between Serum of Patients with Rheumatoid Arthritis and a Preparation (Cohn Fraction II) of Human Gamma Globulin.

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Abstract
Summary The precipitin reaction which has been observed will permit study of the 2 factors, one found in serum of patients with rheumatoid arthritis, the other in human gamma globulin, which interact to give a positive FII test (Heller). This reaction eliminates the need for sheep cells and lends itself to investigation by technics of quantitative immunochemistry (6).