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. Author manuscript; available in PMC: 2016 Jun 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2015 Mar 31;26(6):924–933. doi: 10.1007/s13361-015-1131-0

Figure 3.

Figure 3

Analysis of sterols in SLOS (a) and control (b) human fibroblasts. Cells were trypsinized and different concentrations of the cell suspension were spotted on target. S/N ratios were estimated by integrating the spectrum and dividing the area corresponding to m/z 493 by m/z 488 (corresponding to chemical and instrumental noise)