25008
QDs in RAG cells increased intracellular reactive oxygen species ( ROS ) levels and induced autophagy at 6 h , leading to subsequent apoptosis at 24 h .
 Chemical: oxygen
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: oxygen