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Serum anti‐immunoglobulins of IgG, IgA and IgM types were measured in patients with rheumatoid arthritis, patients with psoriatic arthritis, and normal subjects by absorption on cross‐linked IgG, with subsequent elution. Relatively elevated values of all three types of serum anti‐immunoglobulins were found in seropositive rheumatoids, and elevated values of anti‐immunoglobulins of the IgG type were found in seronegative rheumatoids. Values in patients with psoriatic arthritis fell within the normal range.
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Tapanes et al. (1972) studied this question.
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