FIG. 2.   Typical electropherograms of archaeal T-RFLP generated from rDNA with a labeled reverse primer and HhaI digest obtained from subsamples. The numbers on the peaks indicate major ribotypes commonly observed in various subsamples. Shown are a typical archaeal pattern from the top part of the chimney (subsample I) (A), the surface layer grazed from subsample I (subsample II) (B), the surface layer grazed from the middle part of the chimney (subsample III) (C), the vent surface (subsample IV) (D), the inner soft and porous structure in the root part of the chimney (subsample V) (E), and the outer black and solid structure in the root part of the chimney (subsample VI) (F).