4329
However , down - regulation of ATF4 and / or CHOP expression by siRNA had no effect on helenalin - induced apoptosis in Caki and HCT116 cells .
 Chemical: helenalin
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: helenalin