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(a) Histology from medium-size B-cell pericardial lymphoma of cat 2, showing a monomorphic population of round cells (haematoxylin and eosin, × 200). (b) Immunohistochemistry from cat 2, showing a diffuse strong cytoplasmic positivity for CD79a (B-cell phenotype) (avidin–biotin peroxidase method, × 400). (c,d) Immunohistochemistry from cat 2 showing positive reactivity for feline leukaemia virus antigen p27 (c) and gp70 (d) (avidin–biotin peroxidase method, × 400)
