21008
NMDA receptors have been known to play a central role in long - term potentiation at glutamatergic synapses in principal cells for thirty years .
 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