A researcher inactivates Lefty1,a gene expressed in the anterior visceral endoderm of the mouse.What effect would inactivation of this gene have on the gastrula-stage embryo?
A) The epiblast becomes abnormally thickened throughout its cranial-caudal extent.
B) The primitive streak fails to form.
C) The endoderm fails to form.
D) The neural plate fails to form.
E) Extra primitive streaks form.
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