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Increased expression and activity of Caspase - 3 was also observed in STZ treated rat which specify apoptotic cell death in hippocampus and cortex .
 Chemical: STZ
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: STZ