Abstract

The ultrastructure of splenic lymphoid tissue of two teleost fish, Rutilus rutilus and Gobio gobio , constitutes discrete foci around the small arteries and “melano-macrophage” centres. It contains small and medium lymphocytes, lymphoblasts, macrophages and plasma cells. Plasmacytopoiesis and macrophage-lymphocyte clusters have been described and the significance of “melano-macrophage” centres and macrophage-lymphocyte clusters is discussed.

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