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Spleen sections from arthritic rats stained by the PAP method. (A) CD4+ cells, AA day 14. (B) CD8+ cells, AA day 14. (C) MHC class II+ cells, AA day 14. (D) ED3+ cells, AA day 11. (E) ICAM-1+ cells, AA day 14. (F) NKR-P1+ cells, AA day 14. Mag. × 200.
