title: Anterior regeneration in the hemichordate Ptychodera flava.
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000502:physiology; D049109:Cell Proliferation; D002816:Chordata, Nonvertebrate / Q000166:cytology* / Q000502:physiology*; D004707:Endoderm / Q000166:cytology / Q000502:physiology; D000078404:Epidermal Cells; D004817:Epidermis / Q000502:physiology; D010525:Peripheral Nerves / Q000166:cytology / Q000502:physiology; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism; D012038:Regeneration / Q000502:physiology*
chemical_list: D018809:Proliferating Cell Nuclear Antigen