16146
To investigate the effects of growth ( organ development ) on tetrodotoxin ( TTX ) dynamics in the pufferfish body , TTX - containing feed homogenate was administered to 6 - and 15 - month old non - toxic cultured specimens of the pufferfish Takifugu rubripes at a dose of 40 mouse units ( MU ) ( 8 . 8 mu g ) / 20 g body weight by oral gavage .
 tetrodotoxin, TTX, TTX
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 tetrodotoxin, TTX, TTX