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Evolution of extracellular adenine (A), adenosine (B), hypoxanthine (C), xanthine (D), uracil (E), and uridine (F) concentrations during the first 5 h of pure L. lactis IL-1403 (▴) or S. cerevisiae CEN-PK905 (○) cultures and of the mixed culture (□). The limit of detection is 1 μM.
