Figure 4.

Phylogenetic tree of concatenated derived PmoCAB proteins in methanotrophs. The tree was constructed using neighbor-joining and a Kimura distance correction, based on a concatenation of 891 amino acids total length. The scale bar represents 0.1 change per amino-acid position. Bootstraps values of 1000 constructions are shown at the nodes. Genome accession numbers are listed in parentheses. The pxmABC operon of Methylomicrobium album has been rearranged to match the pmoCAB order of other operons in the concatenation.