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. 2014 Aug 18;9(8):e104654. doi: 10.1371/journal.pone.0104654

Figure 1. Dendrogram of infrared spectra of 57 T. pyogenes isolates from milk samples in comparison with reference strains from the same genus.

Figure 1

Cluster analysis was performed by using the second derivatives of the spectra in the spectral ranges of 500 to 1200 cm−1 and 2800 to 3000 cm−1. Ward's algorithm was applied. The arrows show three independent isolates from the same cow.