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едноезични примери (не са проверени от PONS редакцията)
It is not a teratoma, however, which is a neoplasm comprising all three germ cell layers (ectoderm, endoderm, mesoderm).
en.wikipedia.org This means that two embryonic discs could only unite in locations where the ectoderm is absent.
en.wikipedia.org For example, in neurogenesis, a subpopulation of ectoderm cells is set aside to become the brain, spinal cord, and peripheral nerves.
en.wikipedia.org All the more complex animals (from flat worms to humans) are triploblastic with three germ layers (a mesoderm as well as ectoderm and endoderm).
en.wikipedia.org Animals with radial symmetry, like cnidarians, produce two germ layers (the ectoderm and endoderm) making them diploblastic.
en.wikipedia.org