@webby7160 Hello again; as above: for any content-related revisions please include source citations for corroboration. 
Sure sorry! NCI Dictionary of Cancer Terms
“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. Yellow bone marrow is made mostly of fat and contains stem cells that can become cartilage, fat, or bone cells.”
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