Experimental metabolome profile.

<p>Log-ratios of 220 metabolites detected under two physiological conditions for <i>R. etli</i>: bacteroids during nitrogen fixation (Bac) and free-living conditions (VL). Meanwhile, metabolites (shown in marine blue at the left side of the illustration) detected exclusively under free-living conditions are listed, and the metabolites denoted in red were exclusively detected during bacterial nitrogen fixation (listed on the right side). The rest of the metabolites were detected under both physiological conditions at different ratios (see the middle part of the figure).