9811
Pretreatment of human breast carcinoma MCF - 7 cells for 24 h with the groundnut extract and soybean isoflavone increased gene expression of heme oxygenase - 1 ( HO - 1 ) , a major antioxidative stress enzyme .
 isoflavone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 isoflavone