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phages on Earth. Further, 97% of viruses are in soil and sediment-two underinvestigated biomes that combined account for only ∼2.5% of publicly available viral metagenomes. The majority of the most abundant viral sequences from all biomes are novel. Our analysis drawing on all publicly available viral metagenomes observed a mere 257,698 viral genotypes on Earth-an unrealistically low number-which attests to the current paucity of viral metagenomic data. Further advances in viral ecology and diversity call for a shift of attention to previously ignored major biomes and careful application of verified methods for viral metagenomic analysis.
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Güemes et al. (2016) studied this question.
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