Summary
Neutral free D-amino acid contents in the serum, kidney, liver, brain, small intestine and urine in germ-free mice and those in specific pathogen-free mice were compared. No significant difference was found. This strongly suggests that the free D-amino acids which were shown to be present in mice in our previous work1, 2 did not originate from the enteric microbial flora.
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Nagata, Y., Akino, T. D-Amino acids in mouse tissues are not of microbial origin. Experientia 46, 466–468 (1990). https://doi.org/10.1007/BF01954232
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DOI: https://doi.org/10.1007/BF01954232