6293
Genotoxicity was most pronounced in quartz DQ12 - treated rats , where all genotoxicity markers gave statistically significant positive results , indicating considerable genotoxic stress such as occurrence of DNA double - strand breaks ( DSB ) , and oxidative damage with subsequent repair activity .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None