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What is the difference between Ectoderm and Endoderm?

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• Ectoderm is the outermost layer of the primary germ cells, but the endoderm is the innermost layer of the early embryo.

• Both cell layers line some common as well as separate organs but endoderm never lines any exteriorly exposed organ.

• Few genes are required to form the ectoderm, but most of the genes of the genome are required to form the endoderm.

• The endoderm cells are mostly columnar shaped while there is no particular shape or has almost all the shapes of cells in ectodermic cells after differentiation.

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