Hensen's node - the 'organizer' of the amniote embryo.
D000818:Animals; D001755:Blastocyst / Q000502:physiology*; D001756:Blastoderm / Q000502:physiology* / Q000637:transplantation / Q000648:ultrastructure; D002454:Cell Differentiation; D002490:Central Nervous System / Q000196:embryology*; D006801:Humans