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Lymph node from pigs in stages I (A), II (B), and III (C). Note slight (A), moderate (B) and severe (C) diminished number of CD3 lymphocytes, and disorganisation of T-cell areas (B, C). Immunolabelling with anti-CD3 in formalin-fixed, paraffin-embedded tissue, using the ABC method and Mayer’s haematoxylin counterstain (original magnification 4×).
