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. 2012 May 17;7(5):e37189. doi: 10.1371/journal.pone.0037189

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Ziegler 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 properly credited.

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Unsupervised hierarchical cluster analysis (Dice algorithm) of complex MALDI-TOF MS spectra (m/z 3000 to 15000) of rhizobia found inside nodules of G. max from a field in the Swiss state of Ticino (NG_Field), or of G49 isolated from nodules of soybean (NG_G49), siratro (NM_G49), and cowpea (NV_G49). Spectra from free-living cells of G49 (FL_G49), NGR234 (FL_NGR), and USDA257 (FL_USDA), were also included. A. tumefaciens (Atum) was used as an outgroup.