RAPD fingerprints of 26 PDD isolates and 2 type strains. Lanes and strains are as follows: 1, T. denticola JCM8225; 2, T. phagedenis ATCC 27087; 3, HT201; 4, YG3903R; 5, YG5618; 6, HG42; 7, IZ6-2; 8, IZ7-2; 9, CH6; 10, CH9; 11, HD21-66; 12, HD21R-R7; 13, HD22-63; 14, HD22R-16; 15, HD23-1; 16, HD24-2; 17, HD26-43; 18, HD26-67; 19, HD26-R4; 20, HD26-R5; 21, HD27-4; 22, HD27-24; 23, HD27-R6; 24, HD30-R16; 25, HD31-84; 26, HD32-R10; 27, HD33-86; and 28, HD34-27. Lanes M contain 1.0-kb (left) and 0.1-kb (right) ladder markers.