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Mixed cultures of mouse cortical cells were challenged with toxic concentrations of N - methyl - d - aspartate ( NMDA ) for 10 min , and neuronal death was assessed 20 h later .
 Chemical: N - methyl - d - aspartate; 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: N - methyl - d - aspartate; Chemical: NMDA