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Amplification of soil DNA with cluster-specific PCR primers. The numbers at the top are cluster designations (see Fig. 3). C and E indicate soils 9C and 9E, respectively. Clusters 1, 3, and 5 contain only soil 9C clones. Clusters 2, 4, 6, 7, and 8 contain only soil 9E clones. Lane M contained a DNA ladder. The arrows indicate the DNA fragments amplified by the PCR primer pairs.
