Neighbor-joining tree depicting representatives of the most abundant Oxalobacteraceae OTUs (in bold; number of sequences represented are in brackets) and related sequences from the NCBI database.

The tree was calculated using the Kimura two-parameter model. The scale bar represents number of substitutes per site. Numbers at the nodes indicate bootstrap values (1000 replicates). Symbols indicate sequence origin: brown square- soil; green triangle- rhizosphere; yellow circle- human and mouse skin swabs; blue diamond- fresh water; red star- air and dust; and purple cross- clean room. Sequences from other origins are underlined.