title: FDA faces regulatory challenges with new approaches to medicine.
authors: Washington, DC, USA.
authors: Bob
authors: B
authors: Roehr
mesh_terms: D064987:Cell- and Tissue-Based Therapy / Q000379:methods*; D033161:Government Regulation; D006801:Humans; D044968:Regenerative Medicine / Q000458:organization & administration*; D014481:United States; D014486:United States Food and Drug Administration / Q000458:organization & administration*