26680
These results together with overaccumulation of superoxide ( O 2 ( * - ) ) and H2O2 in leaves revealed that Cu exposures induced oxidative stress .
 Chemical: superoxide; Chemical: O 2 ( * - ); Chemical: H2O2; Chemical: Cu
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: superoxide; Chemical: O 2 ( * - ); Chemical: H2O2; Chemical: Cu