Fig. 2.

Line graphs show typical standard curves for a N⁶-etheno-ATP, b N⁶-etheno-ADP, c N⁶-etheno-AMP, d N⁶-etheno-adenosine (ADO), and e N⁶-etheno-adenine (ADE) using reverse phase high-performance liquid chromatography as described in detail in the “Analytical methods” section. Chromatogram (f) shows the baseline separation of N⁶-etheno-ATP, N⁶-etheno-ADP, N⁶-etheno-AMP, N⁶-etheno-adenine, and N⁶-etheno-adenosine using reverse phase high-performance liquid chromatography as described in detail in the “Analytical methods” section