8846
Nonetheless , mutation rates in the Pol alpha mutator strain are 5 - to 25 - fold lower in an exo1 Delta strain as compared to an msh2 Delta strain completely lacking MMR , indicating that in the absence of Exo1 , most replication errors made by Pol alpha can still be removed in an Msh2 - dependent manner by other nucleases and / or by strand displacement .
 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