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In total , 75 proteins showed significant changes over 1 . 5 - fold in curcumin - treated cells compared to control cells ( Student ' s t - test , p < 0 . 05 ) .
 curcumin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 curcumin