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We describe the structure of the spleen of the African lungfish Protopterus annectens in freshwater conditions, and after 6 months of aestivation. The spleen is formed by cortical tissue that surrounds the splenic parenchyma. The cortex is a reticulum that contains two types of granulocytes, developing and mature plasma cells, and melanomacrophage centres (MMCs). The parenchyma is divided into lobules...
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