Abstract
Mesoderm migration across the inner surface of the outer embryonic layer is an essential morphogenetic mechanism in vertebrate gastrulation. Conserved traits of this process are (1) cadherin-dependent cohesion of the mesoderm, and (2) a predominant role for fibronectin in mediating mesoderm cell-substrate interactions. Compared to lower vertebrates, differentiation of the outer substrate-forming cell layer is accelerated in amniotes, providing mesoderm cells with a basement membrane substrate instead of a loose network of extracellular matrix fibrils. Guidance cues which determine the direction of mesoderm migration have been demonstrated in the fibrillar matrix of the amphibian gastrula.
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