Two commonly used epitope tags are FLAG, which encodes the amino acid sequence DYKDDDDK (single-letter amino acid code), and myc, which encodes the sequence EQKLISEEDL.

TLS Online TPP Program

#Id: 1593

#Unit 5. Developmental Biology

Hensen’s node is the functional equivalent of the organizer (dorsal lip of the amphibian blastopore)

TLS Online TPP Program

#Id: 1594

#Unit 5. Developmental Biology

Primitive Pit 

A funnel-shaped depression at the center of Hensen’s node through which cells migrate to form the notochord and prechordal plate.

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#Id: 1595

#Unit 5. Developmental Biology

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

TLS Online TPP Program

#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.