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Bone Marrow
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.
https://en.wikipedia.org/wiki/Bone_marrow
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.
https://en.wikipedia.org/wiki/Bone_marrow
