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Using GAD67 - GFP transgenic mice , we established that , in both control and PRS mice , high levels of DNMT1 and 3a were preferentially expressed in GABAergic neurons of frontal cortex and hippocampus .
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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