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The aim of the work was ( 1 ) investigating on gender - dependence of disease progression in the standard model for ALS - the transgenic mouse bearing superoxide dismutase 1 gene mutations - and ( 2 ) assessing if a P2X7 receptor antagonist treatment should take into account sexual dimorphism .
 Chemical: superoxide
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