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| The process of
duct |
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| formation is |
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| apparently two
step. |
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| Removal of the |
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| surface ectoderm |
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| allowed cord |
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| formation, but no |
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| epithelial |
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| development by
the |
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| cord of cells. |
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| It turns out that
the |
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| surface ectoderm |
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| and the lateral
plate |
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| expresses a BMP-4 |
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