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Furthermore , our studies revealed that KYNA exerts a protective effect on SH - SY5Y cells by increasing their viability through a mechanism independent from NMDA receptors .
 Chemical: KYNA; 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: KYNA; Chemical: NMDA