1555
When rats pretreated with p - CPA were given 5 - hydroxytryptophan ( 75 mg / kg s . c . ) 30 min before narcotic administration , the activity - decreasing response to narcotics was restored .
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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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