The evolving concept of a stem cell: Entity or function?

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1. NCI NIH HHS [CA59717] Funding Source: Medline
2. NHLBI NIH HHS [HL65572] Funding Source: Medline
3. NIA NIH HHS [AG09521] Funding Source: Medline
4. NICHD NIH HHS [HD 18179] Funding Source: Medline
5. NIGMS NIH HHS [GM07149] Funding Source: Medline