FIG. 3.

Phylogenetic tree for partial sequences of environmental clones and the most closely related cultured organisms. Environmental clones are indicated by boldface type and each clone is designated by the library designation followed by a number. One clone representing each different OTU detected by the RFLP analysis of the five genetic libraries is included. The bar indicates 10% estimated sequence divergence. The number of clones in each genetic library belonging to each phylogenetic group is indicated on the right.