title: Isolation and characterization of a low-molecular-weight substance activating head and bud formation in hydra.
mesh_terms: D000818:Animals; D001681:Biological Assay; D002478:Cells, Cultured; D002498:Centrifugation; D002845:Chromatography; D006829:Hydra / Q000502:physiology*; D008722:Methods; D008970:Molecular Weight; D010455:Peptides / Q000302:isolation & purification*; D011402:Pronase; D012038:Regeneration; D014020:Tissue Extracts / Q000032:analysis; D014462:Ultrafiltration
chemical_list: D010455:Peptides; D014020:Tissue Extracts; D011402:Pronase