DGGE profiles of 16S rDNA genes derived from filtered hydrothermal water from drilled holes (lanes A, D, and F), natural vents (lanes B, E, G, and H), and the substratum of catheter-type in situ growth chamber (lane C) with primer sets for the domain Bacteria and Archaea. The bands labeled with numbers were sequenced. Bands: 1, SUIYO-E1; 2, SUIYO-E2; 3, SUIYO-E3; 4, SUIYO-E4; 5, SUIYO-E5; 6, SUIYO-E6; 7, SUIYO-E7; 8, SUIYO-E8; 9, SUIYO-E9; 10, SUIYO-E10; 11, SUIYO-E11; 12, SUIYO-E12; 13, SUIYO-E13; 14, SUIYO-E14; 15, SUIYO-E15; 16, SUIYO-A16; 17, SUIYO-A17.