27776
Flow cytometric analysis with annexin V and propidium iodide staining demonstrated that 1 induced HepG2 cell apoptotic events in a dose - dependent manner ( 0 - 8 mu g / mL ) .
 propidium iodide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 propidium iodide