Gastrulation in Reptiles and Birds Includes a Thickening Called Hensen's

Multiple Choice

Gastrulation in reptiles and birds includes a thickening called Hensen's node, which is similar to the dorsal lip of an amphibian blastopore. Based on this, you would expect to see _______ in this region.

A) neural tube cells
B) signaling molecules that organize the developing embryo
C) modified mesodermal tissue
D) a well-developed archenteron
E) None of the above