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. 2020 Mar 13;6:11. doi: 10.1038/s41522-020-0121-6

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© The Author(s) 2020

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Fig. 4 — The group of never or current smokers are shown on the x-axis and the relative abundances is shown on the y-axis (on a logarithmic scale). Blue indicates abundance in never smokers, while yellow indicates abundance in current smokers.