13687
Increasing the initial plasma concentration to 50 micro g / mL increased the NA appearance half - life in human and rat plasma to 4 . 66 and 6 . 47 h , respectively .
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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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