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bone marrow  the soft, spongy material in the cavities of bones, consisting of a network of blood vessels and connective tissue fibers that hold together fat and blood-producing cells. Its chief function is to manufacture erythrocytes, leukocytes, and platelets; these blood cells normally do not enter the bloodstream until they are fully developed, so that the marrow contains many immature cells. There are two types of marrow, red and yellow.




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