DGGE of PCR-amplified 16S rRNA genes and phylogenetic characterization of the microorganisms amplified from the ECP-degrading culture using the partial sequence of the 16S rRNA gene. Lanes: 1, 97% similar to uncultured eubacterial clone OCG6; 2, 92% similar to a syntrophic propionate-oxidizing bacterium, KoProp1; 3, 96% similar to a clone, KB13; 4, ECP-degrading culture. Numbers in parentheses indicate GenBank accession numbers.