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Herein we add physiological and functional support to this hypothesis using Lu AF21934 , a novel selective and brain - penetrant mGlu4 receptor positive allosteric modulator ( PAM ) tool compound .
 Chemical: Lu AF21934
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: Lu AF21934