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Apoptotic and necrotic cell levels were measured by double staining with Hoechst 33258 and propidium iodide ( PI ) as well as Annexin V staining .
 Chemical: Hoechst 33258; Chemical: propidium iodide
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: Hoechst 33258; Chemical: propidium iodide