General mechanisms of regeneration as elucidated by experiments of planarians and by a new formulation of the morphogenetic field concept.
D000818:Animals; D002454:Cell Differentiation; D004625:Embryo, Nonmammalian; D009024:Morphogenesis; D012038:Regeneration; D012617:Sea Urchins / Q000196:embryology; D014419:Turbellaria; D014945:Wound Healing