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Dexmedetomidine , acting through central alpha - 2 adrenoceptors , prevents opiate - induced muscle rigidity in the rat .
 Chemical: Dexmedetomidine; Disease: muscle rigidity
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: Dexmedetomidine; Disease: muscle rigidity