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Both , production of reactive oxygen species as well as activation of NF - kappaB have been implicated in severe neuronal damage in different sub - regions of the hippocampus as well as in the surrounding cortices .
 Chemical: oxygen; Disease: neuronal damage
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: oxygen, neuronal damage 
Answer:
 Chemical: oxygen; Disease: neuronal damage