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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2013 Apr 17;24(11):1700–1709. doi: 10.1007/s13361-013-0605-1

Figure 1.

Figure 1

Diagram and operation scheme of the dual valve dual pump LC-MSn system. Valve positions shown for filling sample loop (A), sample loading onto column (B), rinsing column (C), and peptide elution and detection (D). Detailed description is given in text.