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Activation of the nuclear enzyme poly ( ADP - ribose ) polymerase ( PARP ) by oxidant - mediated DNA damage is an important pathway of cell dysfunction and tissue injury in conditions associated with oxidative stress .
 Chemical: poly ( ADP - ribose )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: poly ( ADP - ribose )