8842
Deleting EXO1 was previously shown to increase mutation rates to a greater extent when combined with a mutator variant ( pol3 - L612M ) of the lagging strand replicase , DNA polymerase delta ( Pol delta ) , than when combined with a mutator variant ( pol2 - M644G ) of the leading strand replicase , DNA polymerase epsilon ( Pol epsilon ) .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None