7072
The tolerant species K . obovata tended to acclimate to metal stress by restricting the translocation of toxic metals and by increasing and / or maintaining high superoxide dismutase ( SOD ) activity , minimizing lipid peroxidation , and exhibiting prolonged unaltered growth ( 49 days ) under Pb treatment .
 Chemical: superoxide; Chemical: Pb
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: Pb