12047
Quantitative real - time polymerase chain reaction analysis showed that following the exposure of cells to SiO ( 2 ) NPs , the messenger RNA level of apoptotic genes ( caspase - 3 and caspase - 9 ) were upregulated in a dose - dependent manner .
 Chemical: SiO ( 2 )
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: SiO ( 2 )