2213
Our results revealed that pias1 gene expression is rapidly induced upon NMDA receptor activation in rat hippocampus , but this effect is blocked by transfection of sub - threshold concentrations of ERK1 siRNA / ERK2 siRNA or CREB siRNA .
 Chemical: NMDA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: NMDA