16148
TTX content ( mu g / g ) in each tissue , determined by liquid chromatography / mass spectrometry , revealed that the TTX distribution profile , particularly the TTX content of the liver , greatly differed between the two ages ; the TTX score of 15 - month old fish ( 3 . 3 mu g / g ) was nearly 5 - fold that of 6 - month old fish ( 0 . 68 mu g / g ) .
 Chemical: TTX; Chemical: TTX; Chemical: TTX; Chemical: TTX
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: TTX, TTX, TTX, TTX 
Answer:
 Chemical: TTX; Chemical: TTX; Chemical: TTX; Chemical: TTX