5281
With respect to sensitivity , with the applied method exogenous ( 13 ) C - FA could have been detected in blood at a concentration approximately 1 . 5 % of the endogenous FA blood concentration .
 Chemical: ( 13 ) C - FA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: ( 13 ) C - FA