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Bone marrow
Bone marrow is a fatty semi-liquid substance located in bones, especially in the vertebra (though very different from the spinal cord), the shoulder blades and the pelvis in adults.
Red bone marrow produces stem blood cells which, when mature, become blood cells. Thus it renews the red blood cells (ethrocytes), which carry oxygen, the white blood cells (leucocytes), which participate in the immune system, and platelets which participate in coagulation. It can be the site of a malignant transformation in the leucocytes and lead to leukaemia.