TLDR  It's not possible to get unlimited hair for transplants from the same donor area.   
     
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                  of the study.
                       82 citations
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  May 2004   in “British Journal of Dermatology”    Stem cells are present in plucked hair follicles and can be maintained in culture.  
      153 citations
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  August 2002   in “Dermatologic Surgery”
           153 citations
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  August 2002   in “Dermatologic Surgery”    Follicular Unit Extraction (FUE) is a less invasive hair transplant method with minimal scarring, suitable for about 60% of patients, especially those needing fewer grafts and quicker recovery.