6783
Differences in the magnitude of tolerance among CB ( 1 ) agonists during chronic treatment may be indicative of differences in their pharmacological efficacy , whereas the enhanced sensitivity to behaviorally disruptive effects of CB ( 1 ) antagonists may provide evidence for CB ( 1 ) - related behavioral and / or physical dependence .
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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:
 None