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

question 2

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

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