21696
Apoptosis was evaluated by staining cells with propidium iodide and quantifying sub - Gl peak by flow cytometry .
 Chemical: propidium iodide
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: propidium iodide 
Answer:
 Chemical: propidium iodide