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Pias1 gene expression is similarly induced by overexpression of the ERK1 / ERK2 plasmids in rat hippocampus , and this effect is also blocked by sub - threshold concentration of CREB siRNA transfection .
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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