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5. Compartmentalization

Blood vessels within bones act as a barrier to prevent immature blood cells from leaving marrow. Membrane proteins on blood cells attach to the inner walls of blood vessels to enter the bloodstream. These proteins are only present on mature blood cells. Specific types of cells tend to form groups in certain areas of the marrow, the process of compartmentalization. Macrophages, a type of white blood cell, and red blood cells move towards blood vessels, while other types of white blood cells, granulocytes, clump around the borders.

compartmentalization bone marrow

selvanegra / Getty Images

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