FIG. 3.

Dendrogram constructed from sequencing a fragment of the ahp gene from 57 P. gingivalis strains. The columns on the right show the strain designation, including our own reference number in parentheses, the allele types of the four genes sequenced, the presence or absence and pattern of hybridization to the probe identifying the ragB locus, the presence (+) or absence (−) of hybridization to the probe identifying IS1598, the isolation site and clinical diagnosis as presented by the contributor of the strain, and the geographic origin of the strain. Sequence types represented by multiple strains are contained in with boxes designated by capital letters. CCUG = Culture Collection University of Göteborg, Göteborg, Sweden; ATCC = American Type Culture Collection, Rockville, Md; Strain OMZ 488 = B262 (PGF56) showed positive catalase reaction; UK, United Kingdom.