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CPE treatment significantly inhibited H2 O2 - induced apoptotic processes such as chromatin condensation , caspase 3 activation and anti - poly ( ADP - ribose ) polymerase ( PARP ) cleavage .
 H2 O2, poly ( ADP - ribose )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 H2 O2, poly ( ADP - ribose )