5280
During and after exposure of the rats to ( 13 ) C - FA their blood was analyzed to determine the ratio between labeled and natural FA in blood and the total blood concentration of FA .
 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