6497
Although experimental evidences suggest that the intestinal microbiota is able to incorporate and degrade some of the available amino acids , it appears that the microbiota is also able to synthesize amino acids raising the view that amino acid exchange between the microbiota and host can proceed in both directions .
 amino acids, amino acids, amino acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 amino acids, amino acids, amino acid