1877
In addition , we observed that the persistent increase in the rat spontaneous locomotion is associated with increased TBARS levels and superoxide generation in submitochondrial particles in the prefrontal cortex , striatum and amygdala .
 Chemical: superoxide
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: superoxide