Stem cells in the bone marrow express different molecular markers depending on whether they form bone or other tissue types. Stem cells found in the bone marrow are not all the same. These cells ...

and blood-forming stem cells must make about 200 billion new red blood cells each day to keep the oxygen flowing. For many years, scientists assumed that blood production took place in the bone marrow ...

When people donate blood, stem cells in the bone marrow make new blood cells to replace what was lost. This stress can drive the selection of certain clones—groups of blood cells with a slightly ...