| It is assumed that lepospondyls were physiologically amphibians in lacking the extraembryonic membranes of amniotes and laying their eggs in the water. |
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| The ICM will also give rise to yet another extraembryonic tissue, the primitive endoderm, which is first visible as a cuboidal layer of cells lining the blastocoelic cavity on the fourth day of development. |
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| Subsequent cell and tissue interactions lead to the functional differentiation of all embryonic and extraembryonic tissues. |
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| Cells of the epithelium are bound basally to a laminal matrix and apically to an extraembryonic matrix. |
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| The apical microvilli of these cells reach into the hyaline layer, a component of the extraembryonic matrix. |
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| The microvilli which secure PMCs to the hyaline layer shorten, as the cells reduce their affinity for the extraembryonic matrix. |
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| Proteomic analysis of the extraembryonic tissue from cloned porcine embryos. |
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| Expression of the novel basic helix-loop-helix gene eHAND in neural crest derivatives and extraembryonic membranes during mouse development. |
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| Smad2 signaling in extraembryonic tissues determines anterior-posterior polarity of the early mouse embryo. |
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