The run-on reaction is usually done in the presence of labeled nucleotides so the products will be labeled.

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#Id: 1595

#Unit 5. Developmental Biology

The primitive streak defines the major body axes of the avian embryo. 

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#Id: 1596

#Unit 5. Developmental Biology

The axis of the primitive streak is equivalent to the dorsal-ventral axis of amphibians.

TLS Online TPP Program

#Id: 1597

#Unit 5. Developmental Biology

Mediolateral intercalation in the formation of the primitive streak (Cellular Dance Mechanism) cells came down the sides of the epiblast to undergo a medially directed intercalation of cells in the posterior margin

TLS Online TPP Program

#Id: 1598

#Unit 5. Developmental Biology

Cell migration mediated by the activation of the Wnt planar cell polarity pathway in the epiblast next to Koller’s sickle, at the posterior edge of the embryo.

TLS Online TPP Program

#Id: 1599

#Unit 5. Developmental Biology

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

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#Id: 1600

#Unit 5. Developmental Biology

Convergent extension is responsible for the progression of the streak.