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The remains of a 4,500-year-old horse, found in melted Siberian permafrost in 2009, is undergoing analysis in a Russian lab researching ancient viruses.
A former centre for the development of biological weapons in Soviet times, the Vektor laboratory is one of only two facilities in the world to store the smallpox virus, and has developed the EpiVacCorona vaccine, which is scheduled to begin mass production later this month.
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But in collaboration with the University of Yakutsk, the lab in the Novosibirsk region is now searching for paleoviruses in prehistoric animals, including mammoths, elk, dogs, partridges, rodents and hares, furthering study into virus evolution.