17714
Intracerebroventricular ( i . c . v . ) injection of 1 nmol NPS 5 min after training not only facilitated object recognition memory formation , but also prolonged memory retention in both tasks .
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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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