As development continues, the epiblast invades inward toward the primitive endoderm. This begins the differentiation into the three germ layers that will construct all other bodily tissues: ectoderm, ...
In utero, the blastocyst implants and all three embryonic germ layers are formed during gastrulation. Somatic stem cells are present in many fetal and post-natal tissues. Somatic stem cells are ...
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