P nucleotide addition results when the DNA hairpin at the coding joint is cleaved asymmetrically.

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#Id: 10076

#Unit 4. Cell Communication and Cell Signaling

Integrins are the principal receptors used by animal cells to bind to the extracellular matrix. 

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#Id: 10094

#Unit 4. Cell Communication and Cell Signaling

Activation of integrins involves:

Conformational changes near the propeller and 

 βA domains

Separation of the transmembrane and cytoplasmic domains

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#Id: 1136

#Unit 2. Cellular Organization

Phosphatase in cell cycle-

Cdc25 phosphatase Activates CDKs

Cdc14 phosphatase Activates Cdh1 to degrade mitotic cyclins

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#Id: 191

#Unit 5. Developmental Biology

At slightly lower concentrations (intermediate concentrations), activin (about 100 molecules per cell) activated the Xbra gene and instructed the cell to become muscle.

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#Id: 6958

#Unit 8. Inheritance Biology