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In the present study , effects of nicotine on catalepsy induced by morphine in mice have been investigated .
 Chemical: nicotine; Disease: catalepsy; Chemical: morphine
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:
 Chemical: nicotine; Disease: catalepsy; Chemical: morphine