PlanariansPlatyhelminthsTurbellariaHelminth ProteinsRegenerationGenome, HelminthRhodospirillalesCestodaRNA InterferenceSchistosoma mansoniFirefliesDNA, HelminthPhylogenyStem CellsIn Situ HybridizationGenes, HelminthMolecular Sequence DataFasciola hepaticaAnnelidaTotipotent Stem CellsNervous System Physiological PhenomenaHeadExpressed Sequence TagsBody PatterningSmad Proteins, InhibitoryInvertebratesSchistosoma japonicumAmino Acid Sequence