15574
We investigated the metabolic response of amino acids in the brain of highly sensitive salmonid Oncorhynchus mykiss ( rainbow trout ) , the less sensitive cyprinid Cyprinus carpio ( common carp ) and the highly resistant cyprinid Carassius auratus ( goldfish ) when exposed to 1mM ammonia ( as NH4HCO3 ; pH 7 . 9 ) for 0 h ( control ) , 3 h , 12 h , 24 h , 48 h , 84 h and 180 h .
 amino acids, ammonia, NH4HCO3
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 amino acids, ammonia, NH4HCO3