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HPLC analysis of free amino acids and GABA. (a) The standard of 20 amino acid including: 1. Asp; 2. Glu; 3. Asn; 4. Ser; 5. Gln; 6. His; 7. Gly; 8. Thr; 9. Arg; 10. Ala; 11. Tyr; 12. Cy2; 13. Val; 14. Met; 15. Nva; 16. Trp; 17. Phe; 18. Ile; 19. Leu; and 20. Lys; (b) The standard of GABA; (c) Sample after enzymatic transformation and fermentation; and (d) Sample in initial state
