25997
Remarkably , in cell - free HeLa cell extracts , the guanine adduct with R absolute chemistry at the N ( 2 ) - dG linkage site is ~ 35 times more susceptible to NER dual incisions than the stereochemically identical N ( 6 ) - dA adduct .
 Chemical: guanine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: guanine