27083
NMDA Receptor Activation Down - Regulates Expression of delta Subunit - Containing GABA - A Receptors in Cultured Hippocampal Neurons .
 NMDA, GABA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 NMDA, GABA