6864
The NMDA receptor subunits NR1 and NR2B and the related protein kinase calcium / calmodulin - dependent protein kinase ( CaMK ) - IV and the transcription factor cyclic AMP responsive element binding protein ( CREB ) - 1 mRNA levels were reduced in the PND 50 mice .
 Chemical: NMDA; Chemical: calcium; Chemical: cyclic AMP
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; Chemical: calcium; Chemical: cyclic AMP