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| Second pharyngeal pouch,ventral: |
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| development of palatine tonsil |
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| • | Third
month: subepithelial |
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| infiltration
of lymphoid tissue: |
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| tonsillar
stroma |
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| • | Extension
of solid epithelial |
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| strands
into stroma |
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| • | Epithelial
strands open up into |
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| tonsillar
crypts |
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| • | Third
trimester: lymphatic follicles |
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| develop
around crypts. |
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