Enzyme immunoassay showed that blood serum from healthy donors contains specific high-affinity antibodies (apparent association constant > or = 5 x 10(9) M(-1)) against a fragment of transcribed region of ribosomal DNA repeat of human serum, which are present in a free form or are bound to extracellular DNA. Preheating of the serum at 55 degrees C and high ionic strength (1.5 M NaCl) had no effect on the interaction of antibodies with this fragment. Competitive binding assay showed that these antibodies recognize DNA epitopes, which differ from the epitopes recognized by most anti-DNA antibodies in systemic lupus erythematosus.

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