Fig. 3.

Comparative phylogenetic tree of all putative LuxS proteins detected within the genomes of 171 rumen bacterial species. Two standards (Vibrio harveyi and Streptococcus pneumoniae) were used for comparison with other samples (highlighted with grey colour). Most abundant four groups were highlighted with colours (orange: Pseudobutyrivibrio, yellow: Prevotella, green: Butyrivibrio and blue: Ruminococcus). Sequences denoted by a square and beginning with MG are those identified by Ghali et al. [9] from rumen metagenomic sequences and those with MT also being derived from the same study using a metatranscriptome dataset