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For example , it is not known whether PBDEs affect adult neurogenesis , a process implicated in learning and memory and in olfactory behavior .
 Chemical: PBDEs
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: PBDEs 
Answer:
 Chemical: PBDEs