FIG. 1.

16S rRNA-based phylogenetic tree for ASF organisms and related species. The scale bar represents a 10% difference in nucleotide sequences, as determined by measuring the lengths of the horizontal lines connecting any two species. The Colobus monkey species isolate was obtained from Lincoln Park Zoo, Chicago, Ill., courtesy of Shelia Davis. The 16S rRNA sequence data for rodent species 1, 2, and 3 were obtained from reference 35.