What is "the node"?
A - The part of the embryo that will eventually become the brain
B - None of these
C - The center of the developing embryo
D - The mammalian equivalent of Spemann's organizer
E - The bird equivalent of Spemann's organizer
Answer: D - The mammalian equivalent of Spemann's organizer
The NODE is the term for the mammalian organizer that organizes body structures and axes. The bird equivalent is Hensen's node.