FIG. 3.

DGGE profiles of PCR-amplified 16S rRNA fragments obtained by using universal bacterial primers from the Wadi Gaza field microbial mats (lane WG) and mats collected at the end of the experiments from the microbiological controls (lanes G and GC) and from preparations incubated in the light (lane L) and in the dark (lane D). The labeled fragments were excised, reamplified, and sequenced. The unlabeled bands include those containing cyanobacterial sequences and bacterial bands with sequences similar to the sequences of the labeled bands.