A set of seven structural nucleoporins forms a Y-shaped structure about the size of the ribosome, known as the Y complex.

TLS Online TPP Program

#Id: 1599

#Unit 5. Developmental Biology

The Wnt PCP pathway activated by fibroblast growth factors (FGFs) produced by the hypoblast.

TLS Online TPP Program

#Id: 1600

#Unit 5. Developmental Biology

Convergent extension is responsible for the progression of the streak.

TLS Online TPP Program

#Id: 1601

#Unit 5. Developmental Biology

If Wnt PCP pathway is blocked, the mesoderm and endoderm form peripherally instead of centrally.

 

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#Id: 1602

#Unit 5. Developmental Biology

As cells enter the primitive streak, they undergo an epithelial-to-mesenchymal transformation.

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#Id: 1603

#Unit 5. Developmental Biology

The elongation of the primitive streak coextensive with the anterior migration of secondary hypoblast cells, and hypoblast directs the movement of the primitive streak.

TLS Online TPP Program

#Id: 1604

#Unit 5. Developmental Biology

Amniote cell specification (germ layer identity)is established before gastrulation starts, but the specification of cell type is controlled by inductive influences during and after migration through the primitive streak.