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. Author manuscript; available in PMC: 2022 Jun 15.
Published in final edited form as: FASEB J. 2020 Mar 26;34(5):6129–6146. doi: 10.1096/fj.201902982R

Figure 2.

Figure 2.

Representative MS1 spectra of Ser256 phosphopeptide of AQP2 showing an increase in dDAVP-treated (labeled with light amino acids) samples compared to vehicle treated or control (labeled with heavy amino acids) samples of (A) PKA-intact and (B) PKA-null cells. The phosphorylation site was marked in red in the peptide sequence. The vertical axis shows peptide ion intensity, and the horizontal axis shows the mass-to-charge ratio (m/z). Each peptide has several m/z peaks due to the presence of natural isotopes.