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. 2016 Jan 28;11(1):e0147414. doi: 10.1371/journal.pone.0147414

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© 2016 Valletta et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 2 — (A) Principal component analysis of mass spectra dataset containing intensities of 84 m/z for pure MEF and hESC populations and their 1:1 mixture. (B) Scree plot documenting the presence of three factors contributing predominantly to the overall variability in the analyzed dataset. (C) Pre-processed MALDI-TOF mass spectra for pure hESCs and MEFs and a hESCs + MEFs two-component mixture containing 99% hESCs and 1% MEFs. The spectra were normalized to vector of unit length (a.u.). Asterisks indicate peaks at m/z 3992 and 9908. (D) Surface plot of intensities of peaks at m/z 3992 and 9908 versus the number of MEFs in hESCs + MEFs two-component mixtures.