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Fluoresence emission change of Cd2+–ACAQ at 500 nm in response to the addition of 15 equiv amino acids in 1:99 ACN:HEPES buffer solution (pH 7.4) at 298 K (excitation at 350 nm): 1. D-Cys; 2. L-Cys; 3. GSH; 4. L-Met; 5. DL-Hcy; 6. N-Ac-L-Cys; 7. MPA; 8. L-Asp; 9. D-Asp; 10. D-Glu; 11. L-Glu; 12. D-Lys; 13. L-Lys; 14. D-Ser; 15. L-Ser; 16. D-Tyr; 17. L-Tyr; 18. D-Val; 19. L-Val; 20. D-Phe; 21. L-Phe; 22. D-His; 23. L-His.
