Published Online: Feb 08 2017
The primitive streak is currently considered as the landmark of amniote gastrulation. However, a close look at gastrulation in reptiles reveals the absence of the primitive streak and the presence of a blastopore slit. We review what is known about gastrulation in the three groups that constitute the amniote clade, reptiles, avians and mammals, and the molecular mechanisms driving this morphogenetic event, with an evolutionary perspective.
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