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As cancers are caused by dysregulation of various proteins , we investigated target proteins associated with curcumin by two - dimensional gel electrophoresis ( 2 - DE ) and MALDI - TOF - TOF mass spectrometer .
 curcumin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 curcumin