The polyadenylation site has two cis-acting signals: 

An upstream AAUAAA motif, which is usually located 11 to 30 nucleotides from the site  A downstream U-rich or GU-rich element.

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#Unit 2. Cellular Organization

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#Unit 4. Cell Communication and Cell Signaling

Smad4 was originally called DPC (deleted in pancreatic cancer)

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#Unit 7. System Physiology – Animal

Reduced Ventricular Ejection

the ventricles begin to repolarize, which is marked by the beginning of the T wave on the ECG.

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#Unit 5. Developmental Biology

Inducer 

the tissue that produces a signal (or signals) that changes the cellular behavior of the other tissue.

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#Unit 3. Fundamental Processes

The hMutb complex, a Msh2-Msh3 dimer, binds mismatched insertion/deletion/slippage loops, while the Msh2-Msh6 (hMuta) complex binds to single-base mismatches.