[Relations between the nervous system and regeneration in planarians. 3. Observations on the differentiation of the nervous system and appearance of neurosecretory activity in Dugesia lugubris embryos].
D000818:Animals; D002454:Cell Differentiation; D009420:Nervous System / Q000196:embryology*; D009489:Neurosecretion; D012038:Regeneration; D014419:Turbellaria / Q000196:embryology*