27093
Thus prolonged activation of NMDA receptors in hippocampal neurons reduced GABAR delta subunit expression through Ca2 + entry and at least in part by ERK1 / 2 activation .
 NMDA, Ca2 +
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 NMDA, Ca2 +