PAS-related domain (PRD) repeats mediate phytochrome dimerization. 

The PRD domain targets the Pfr form of phyB to the nucleus, although it lacks a canonical nuclear localization signal (NLS).

TLS Online TPP Program

#Id: 3202

#Unit 3. Fundamental Processes

Repair systems recognize DNA sequences that do not conform to standard base pairs.

TLS Online TPP Program

#Id: 3203

#Unit 3. Fundamental Processes

Excision systems remove one strand of DNA at the site of damage and then replace it.

TLS Online TPP Program

#Id: 3204

#Unit 3. Fundamental Processes

Recombination-repair systems use recombination to replace the double-stranded region that has been damaged.

TLS Online TPP Program

#Id: 3205

#Unit 3. Fundamental Processes

.All these systems are prone to introducing errors during the repair process. 

TLS Online TPP Program

#Id: 3206

#Unit 3. Fundamental Processes

Photoreactivation is a nonmutagenic repair system that acts specifically on pyrimidine dimers

TLS Online TPP Program

#Id: 3207

#Unit 3. Fundamental Processes

Deamination of cytosine creates a U-G base pair. Uracil is preferentially removed from the mismatched pair