1. Looking Back: Cancer Stem Cells
Cell Stem Cell 
Volume 20, Issue 6, (June 2017)
DOI: /j.stem
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2. Catherine A. O’Brien
Princess Margaret Cancer Centre
Cell Stem Cell  , DOI: ( /j.stem )
Copyright © 2017 Elsevier Inc. Terms and Conditions

3. Kornelia Polyak
Dana-Farber Cancer Institute
Cell Stem Cell  , DOI: ( /j.stem )
Copyright © 2017 Elsevier Inc. Terms and Conditions

4. Ben Z. Stanger
Perelman School of Medicine, University of Pennsylvania
Cell Stem Cell  , DOI: ( /j.stem )
Copyright © 2017 Elsevier Inc. Terms and Conditions