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SummaryThe 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).
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Epstein et al. (1956) studied this question.
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