FIG. 4.

Phylogenetic tree, based on 16S rRNA gene sequences, showing the relationship of isolate LR1 to other type II methanotrophs of the Methylocystis/Methylosinus group and to representative members of the alpha subclass of the class Proteobacteria. The 16S rRNA gene sequence from Methylococcus capsulatus was used as an outgroup reference. The numbers indicate the bootstrap values (percentage of outcome) for the respective interior branch points from a neighbor-joining test. Only values above a threshold of 50% are shown. The scale bar represents the estimated number of base changes per nucleotide sequence position.