| 31. | These early signals are essential for heart formation such that removal of the anterior endoderm blocks heart formation.
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| 32. | The epiblast is surrounded by the visceral endoderm, the equivalent of the hypoblast of humans and chicks.
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| 33. | DPPSCs can differentiate in vitro into tissues that have similar characteristics to mesoderm, endoderm and ectoderm layers.
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| 34. | The earliest divisions in animals, the endoderm, mesoderm and ectoderm stem cells have been mentioned above.
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| 35. | There are only two main germ layers, the ectoderm and endoderm, with only scattered cells between them.
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| 36. | Cnidaria develop from two layers of tissue, the ectoderm and the endoderm, and are thus termed gastrula.
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| 37. | Multiple processes control cell lineage specification in the blastocyst to produce the trophoblast, epiblast, and primitive endoderm.
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| 38. | During approximately the same time, WNT3 starts to be expressed in the posterior visceral endoderm of the epiblast.
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| 39. | The endoderm sends a fibroblast growth factor ( FGF ) signal to specify the notocord and the mesenchyme fates.
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| 40. | Le Douarin continued her research on avian embryos, focusing on the interactions between the endoderm and mesoderm layers.
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