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After 7 days of exposure , rSULT1A1 was induced in the cerebellum , frontal cortex , and hippocampus , while rSULT2A1 was induced significantly in all four regions .
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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