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. Author manuscript; available in PMC: 2015 Apr 1.
Published in final edited form as: Curr Opin Organ Transplant. 2014 Apr;19(2):169–174. doi: 10.1097/MOT.0000000000000050

Figure 1.

Figure 1

The four S's of cell-based therapy. Cell source, surveillance, safety, and site must all be considered for cell-therapy to be successful in the clinic.