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Monkeys with acute ( short - term ) MPTP exposure , rapid symptom onset and short symptom duration prior to initiation of levodopa therapy developed dyskinesia between 11 and 24 days of daily levodopa administration .
 MPTP, levodopa, dyskinesia, levodopa
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 MPTP, levodopa, dyskinesia, levodopa