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. 2015 Aug 17;100(10):E1308–E1318. doi: 10.1210/jc.2015-1800

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Figure 5. — Mass spectrometry characterization of the transmembrane α-Klotho protein in human tissues and cells: extracellular α-Klotho peptide GLFYVDFLSQKD (exon 3). A–D, Representative mass spectrometry spectra (left) and Skyline data (right) confirmed the presence of full-length α-Klotho rh full-length α-Klotho protein (rh-α-Klotho) (A), renal proximal tubular epithelial cells (B), kidney tissue (C), and renal artery (D). E–G, The full-length specific (isoform 1) αKlotho peptide LWITMNEPYTR (exon 4). Representative mass spectrometry spectra (left) and Skyline data (right) confirmed the presence of full-length α-Klotho. E), rh full-length α-Klotho protein (rh-α-Klotho); F, kidney tissue; G, renal artery; and H, neuronal cells.