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While powerful antiparkinsonian effects had been observed as early as 1951 , the potential of treating fluctuating Parkinson ' s disease by subcutaneous administration of apomorphine has only recently become the subject of systematic study .
 Disease: Parkinson ' s disease; Chemical: apomorphine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: Parkinson ' s disease; Chemical: apomorphine