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Changes in DGGE patterns of the blue–green (BG) biofilm. The sampling location, BG4, was on the south wall of a small room next to tower 26 on the south side of the inner gallery.
To examine in more detail the structure of the biofilm, samples were collected from the surface to the deepest part by using 23 adhesive sheets. Phylogenetic affiliations at the phylum level are shown next to the band names. Detailed affiliations of these bands are given in Table S2.
