18656
Transcript levels of Dcx also decreased at >= 20ppm , and those of Pcna , Casp3 , Bax , Bcl2 , Pax6 and Tbr2 were unchanged in the dentate gyrus by real - time RT - PCR .
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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