http://www.youtube.com/watch?v=X7k4QePx1cQendofvid
[starttext]Bone marrow is the flexible tissue found in the hollow interior of bones. In adults, marrow in large bones produces new blood cells[endtext]
[starttext]Bone marrow is the flexible tissue found in the hollow interior of bones. In adults, marrow in large bones produces new blood cells[endtext]
