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. Author manuscript; available in PMC: 2017 Dec 1.
Published in final edited form as: Metabolomics. 2016 Nov 2;12(12):187. doi: 10.1007/s11306-016-1130-6

Figure 3.

Figure 3

Principal component analysis of pollen extracts. A) Principal components 1 and 2 utilizing the quantity of all 52 metabolites from 26 pollens, 5 preparations per species: grasses (red x), weeds (blue o), and trees (green +). Dashed circles and names annotate the various clusters. B) Loading plot for principal components 1 and 2 of panel A. Important compounds are labeled. C) Principal components 1 and 2 using a log2 transform of metabolite concentrations (see text). D) Loading plot for principal components 1 and 2 of panel C. Important compounds are labeled.