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Overview of viral metagenomic studies conducted between 2002 and 2013. The cumulative number of publications determined by PubMed searches using the keywords '(virus OR viral OR virome) AND (metagenome OR metagenomics)' is shown on the y-axis. The first viral metagenome and Korean metagenomes (highlighted by arrows), as well as the technical development of high-throughput sequencing platforms (below the highlighted arrow), are shown with the year of publication and/or public release.
