1554
Pretreatment of rats with p - chlorophenylalanine ( p - CPA , 320 mg / kg i . p . ) 48 h before the narcotic injection significantly antagonized the activity - decreasing effects of narcotics .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
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