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. 2012 Jun;166(4):1388–1402. doi: 10.1111/j.1476-5381.2012.01883.x

Figure 2.

Figure 2

Positive DESI mass spectrum of the luminal surface of the mouse trachea. The y axis of the spectrum shows the relative abundance, after automatic scaling of the intensity of the highest signal in the depicted mass range to 100%. ACh was identified in the signal at m/z 146.1170. Since ACh was the only signal detected in the depicted mass range, it was automatically scaled to 100%. The label Δm =−3.4 expresses the exactness of the measured mass of ACh compared with the theoretically calculated mass of ACh.