title: Distribution of the head-activating substance in hydra and its localization in membranous particles in nerve cells.
mesh_terms: D000818:Animals; D001681:Biological Assay; D002452:Cell Count; D002462:Cell Membrane / Q000032:analysis; D002469:Cell Separation; D002498:Centrifugation; D002499:Centrifugation, Density Gradient; D004847:Epithelial Cells; D004848:Epithelium / Q000502:physiology; D006829:Hydra / Q000032:analysis / Q000502:physiology*; D008466:Mechlorethamine; D008722:Methods; D008854:Microscopy, Electron; D008970:Molecular Weight; D009024:Morphogenesis; D009474:Neurons / Q000032:analysis / Q000502:physiology*; D009588:Nitrogen Mustard Compounds / Q000494:pharmacology; D012038:Regeneration; D013997:Time Factors
chemical_list: D009588:Nitrogen Mustard Compounds; D008466:Mechlorethamine