Define the Bone marrow.
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bone MAYR-oh) The soft, spongy tissue that has many blood vessels and is found in the center of most bones. There are two types of bone marrow: red and yellow. Red bone marrow contains blood stem cells that can become red blood cells, white blood cells, or platelets.
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Bone marrow is a semi - solid tissue found within the spongy or cancellous portions of bones . In birds and mammals , bone marrow is the primary site of new blood cell production or haematopoiesis . It is composed of hematopoietic cells , marrow adipose tissue , and supportive stromal cells .
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