Repair systems that target a single type of damage in dna and repair only that type of damage are called systems.

I believe the answer is Specific repair systems. These types of repairs target a single kind of lesion or damage and repair only that damage.DNA repair is a collection of processes by which a cell identifies and corrects damage to the DNA molecule that encodes its genome. DNA damage may result from both metabolic activities and environmental factors such as radiation. 

Where are the phrases