16994
Cell apoptosis was evaluated by annexin V / propidium iodide staining , TUNEL , and reactive oxygen species generation analysis .
 Chemical: propidium iodide; 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: propidium iodide; Chemical: oxygen