Figure 3: Identification of pig kidney Na+/K+-ATPase subtypes by mass spectrometry CID-MS/MS spectra of α-subunit peptides from from 706-724 (A) and 444-456 (B). Total mass chromatograms are shown for the 4-hydroxynonenal (HNE)-unmodified (C) and HNE-modified (D) peptides (444-456).