CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
Enlarged spleen (splenomegaly). Light micrograph of a section through an enlarged spleen that has occurred in myelofibrosis. Myelofibrosis leads to bone marrow losing its ability to produce blood cells. The spleen enlarges to compensate. In a foetus, the spleen produces red blood cells, and it reverts back to this role if other blood producing (haemopoietic) systems fail. Magnification unknown.
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