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. 2015 Feb 1;4:48. doi: 10.1186/s40064-015-0826-9

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© Sekine et al.; licensee Springer. 2015

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.

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Correlation between inhibitory rates for KYNA production and tissue KYN concentration by (a) leucine (Leu), (b) isoleucine (Ile), (c) phenylalanine (Phe), (d) tyrosine (Tyr), (e) methionine (Met), and (f) all five large neutral amino acids. Values are expressed as mean ± SE (n = 4–6). Lines represent linear regression of data.