12373
Considerable effort has been expended on developing an understanding of the molecular and cellular processes that underlie acute MOR signaling , short - term receptor regulation , and the progression of events that lead to tolerance for different MOR agonists .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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