13043
Reactive oxygen species ( ROS ) were detected by 2 , 7 - dichlorofluorescin diacetate fluorophotometry .
 Chemical: oxygen; Chemical: 2 , 7 - dichlorofluorescin diacetate
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; Chemical: 2 , 7 - dichlorofluorescin diacetate