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Useful genes can be screened from various environments by construction of metagenomic DNA libraries. In this study, water samples were collected from several lakes in mid Korea, and analyzed by T-RFLP to examine diversities of the microbial communities. The crude DNAs were extracted by the SDS-based freezing-thawing method, and then further purified using an UltraCleanTM kit (MoBio, USA). The metagenomic...
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