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. Author manuscript; available in PMC: 2019 Feb 13.
Published in final edited form as: Anal Chim Acta. 2014 Aug 11;848:51–60. doi: 10.1016/j.aca.2014.08.001

Fig. 3. PCA of the fused datasets from positive and negative ion mode mass spectra in a low-level approach:

Fig. 3.

(a) PC2 vs. PC3 score plot. (b) PC2 vs. PC3 original loading plots labeled in terms of m/z ratio. PCA of the fused datasets from positive and negative ion mode mass spectra in a mid-level approach: (c) PC1 vs. PC2 score plot. (d) PC1 vs. PC2 original loading plots labeled in terms of m/z ratio. Immature oocytes: green circles (n = 31), 24-hour in vitro matured oocytes: red diamonds (n = 25), 44-hour in vitro matured oocytes: blue triangles (n = 40). Negative ions: green; positive ions: violet.