Fig. (6) Phylogenetic tree of Actinobacterial OTUs as isolated from contaminated and clean soil samples from a depth of 4 m in relation to selected OTUs from Genbank (accession numbers of GenBank OTUs are indicated in brackets). OTUs are reported as Genbank accession numbers. Bootstrap values (%) are indicated for the branches which were similar in more than 50 % of the 1000 regenerated trees.