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. 2014 Nov 21;34(6):e00150. doi: 10.1042/BSR20140134

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© 2014 The Author(s) This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC-BY) (http://creativecommons.org/licenses/by/3.0/) which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC-BY) (http://creativecommons.org/licenses/by/3.0/) which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited.

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1. Aspartate, 2. Glutamate, 3. Cystine, 4. Background, 5. Asparagine, 6. Glutamine, 7. Serine, 8. Citrulline, 9. Glycine, 10. 4-Aminobutyrate, 11. Alanine, 12. Threonine, 13. Valine, 14. Derivatization artifact, 15. Methionine, 16. Unknown, 17. Isoleucine, 18. Tryptophan, 19. Phenylalanine, 20. Benzylserine (a non-naturally occurring amino acid to which other peaks were normalized), 21. Spermine, 22. Ornithine, 23. Lysine, 24. Spermidine.