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DGGE profiles of ammonia-oxidizing bacteria of the β subclass of the Proteobacteria, obtained by CTO PCR on July 2002 samples. Lanes 1 to 18 correspond to the 18 different sampling stations; lanes “WW in” and “WW out” are samples from domestic wastewater before and after treatment, respectively. The principal bands are labeled b1 to b8 (bands that were cut and sequenced). The denaturing gradient is from 39 to 52%.
