Mice were injected with poly-4-vinylpyridine at a dose known to be effective for immunogenesis stimulation. Within 24 hours after the injection fibroblasts reacted by dendrit production, cytoplasm vacuolization and clasmocytosis. 2-3 days after the polymer injection the fibroblast cytoplasm was restored. The immunofluorescence employed rabbit serum natural antibodies to fibroblast antigens. The reaction observed may be used for the estimation of biological polymer activity.

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