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. Author manuscript; available in PMC: 2023 Apr 26.
Published in final edited form as: J Am Soc Mass Spectrom. 2022 Feb 17;33(3):530–534. doi: 10.1021/jasms.1c00343

Figure 1.

Figure 1.

The METLIN-NL mass spectral database was derived from the METLIN-MS2 data on over 860,000 molecular standards. (A) Asymmetric dimethylarginine (ADMA) and its representative METLIN-MS2 spectra at four different collision energies. (B) METLIN-NL spectra (NLintensity vs. Δm/z) of ADMA was generated by calculating the difference between the precursor and fragment ions with NLintensity based on the original fragment ion intensities. “P” refers to precursor ion and “F” refers to fragment ion.