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464 Human Embryonic Development Human embryonic development depends on stem cells. During the course of development, cells divide, migrate, and specialize. Early in development, a group snow whit seven dwarfs porn of cells called the inner cell mass (ICM) forms. These cells are able to produce all the tissues of.
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Later in development, during gastrulation, the three germ layers form, and most cells become more restricted in the types of cells that they can produce.