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TNF-producing cells in a patient with RA with a subsequent good response to infliximab. Sections of synovial biopsy tissue from patient no. 6 before (a) and after (b) treatment with infliximab show diaminobenzidine staining (haematoxylin counterstained) for TNF neutralizing antibodies mAb1 and mAb11. Original magnification × 250.
