2034
At maximum photosensitivity the inhibitory amino acids gamma - aminobutyric acid and taurine were lower , and those of asparagine ( metabolite of the excitatory amino acid aspartate ) were higher , than when the animals were not photosensitive .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None