The CTD contains a series of repeats of the heptapeptide sequence: Tyr-Ser-Pro-Thr-Ser-Pro-Ser. 

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#Unit 3. Fundamental Processes

 In Escherichia coli, mismatches are detected by a dimer of the mismatch repair protein MutS.

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#Unit 6. System Physiology – Plant

Pfr, in turn, can be converted back to Pr by far-red light known as photoreversibility

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#Unit 8. Inheritance Biology

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#Unit 6. System Physiology – Plant

Dehydration triggers de novo production of ABA, which in turn induces expression of stress‐related genes

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#Unit 3. Fundamental Processes

DnaA is the E. coli licensing factor that must be made anew for each round of replication.