6 years ago
Elusive master organizer of human embryo growth seen for the first time
As an early embryo, every mammal, bird, and reptile contains a clump of cells with a remarkable power. Called “the organizer,” it prompts neighboring cells to develop into what will later become the animal’s brain and spinal cord. Biologists have not been able to show that such an organizer exists in human embryos because of ethical constraints on such research.
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