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Following retrovirus infection, reverse transcriptase converts viral RNA into proviral DNA, which is then incorporated into the DNA of the host cell in the nucleus.

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Novel Coronavirus SARS-CoV-2: Scanning electron microscope image shows SARS-CoV-2 (orange)-also known as 2019-nCoV, the virus that causes COVID-19 isolated from a patient in the U.S., emerging from the surface of cells (green) cultured in the lab.

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Dutch microbiologist and botanist Martinus W. Beijerinck (Martinus Beijerinck); undated photo.

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Hand washing. Healthcare worker washing hands in hospital sink under running water. contagious diseases wash hands, handwashing hygiene, virus, human health

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Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar

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United States Electoral College votes by state

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Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.

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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

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Town of Sisimiut located on the coast of the Davis Strait on Kangerluarsunnguaq Bay, Greenland

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The Battle of New Orleans, by E. Percy Moran, c. 1910. Andrew Jackson, War of 1812.

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Following retrovirus infection, reverse transcriptase converts viral RNA into proviral DNA, which is then incorporated into the DNA of the host cell in the nucleus.

Following retrovirus infection, reverse transcriptase converts viral RNA into proviral...

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