Figure 2. Phylogenetic tree build using the partial amino acid sequences derived from the microbial PF00295 polygalacturonase gene fragments from the rumen of the Small Tail Han sheep referenced to polygalacturonase sequences retrieved from GenBank.

The tree was constructed using the neighbor-joining method (MEGA 4.0). The lengths of the branches indicate the relative divergence between pairs of amino acid sequences. The numbers at the nodes are bootstrap values based on 1000 bootstrap replications. Only bootstrap values >50 are displayed. The scale bar represents 0.1 amino acid substitution per position. The reference source strains and their GenBank accession numbers are identified. The highest abundance fragment is marked by a dot (•).