TLS Online TPP Program

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#Unit 5. Developmental Biology

In Permissive interaction

The responding tissue has already been specified and needs only an environment that allows the expression of these traits. 

TLS Online TPP Program

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#Unit 5. Developmental Biology

Epithelial-mesenchymal interactions

the interactions of sheets of epithelial cells with adjacent mesenchymal cells.

TLS Online TPP Program

#Id: 179

#Unit 5. Developmental Biology

Properties of epithelial-mesenchymal interactions:

Regional specificity of induction

Genetic specificity of induction

TLS Online TPP Program

#Id: 180

#Unit 5. Developmental Biology

Regional specificity of induction:

mesenchyme plays an instructive role, calling into play different sets of genes in the responding epithelial cells.

TLS Online TPP Program

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#Unit 5. Developmental Biology

Genetic specificity of induction:

mesenchyme may instruct the epithelium as to what sets of genes to activate, the responding epithelium can comply with these instructions only so far as its genome permits.

TLS Online TPP Program

#Id: 182

#Unit 5. Developmental Biology

Epithelial-Mesenchymal Transition

An orderly series of events whereby epithelial cells are transformed into mesenchymal cells.