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Undated handout image shows a single glowing hematopoietic stem ...
Reuters
Wed Apr 30, 4:08 PM ET
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Undated handout image shows a single glowing hematopoietic stem cell in its natural environment at the edge of bone marrow in a section of mouse scapula.

(University of Michigan Medical School/Douglas Engel, Ph.D,./Handout/Reuters)

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