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Furthermore , the expression levels of Bcl - 2 and Bax and the levels of cleaved Caspase3 in the hippocampus were evaluated by RT - PCR and Western blotting .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None