Adult Stem CellsStem CellsStem Cell TransplantationCell DifferentiationEmbryonic Stem CellsHematopoietic Stem CellsMultipotent Stem CellsMesenchymal Stromal CellsPluripotent Stem CellsStem Cell NicheCell LineagePlanariansRegenerationMesenchymal Stem Cell TransplantationRegenerative MedicineInduced Pluripotent Stem CellsHematopoietic Stem Cell TransplantationStem Cell ResearchCell ProliferationNeural Stem CellsCells, CulturedCell Culture TechniquesBone Marrow CellsCell SeparationCell- and Tissue-Based TherapyFetal Stem CellsNeoplastic Stem CellsAging, PrematureStem Cell FactorDental PulpTissue EngineeringHair FollicleOctamer Transcription Factor-3