13440
N - methyl - d - aspartate receptors ( NMDARs ) are ligand - gated ion channels ( ' ionotropic ' receptors ) activated by the major excitatory neurotransmitter , l - glutamate .
 Chemical: N - methyl - d - aspartate; Chemical: l - glutamate
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: N - methyl - d - aspartate; Chemical: l - glutamate