University of Utah Health Nov 20 2024 Viruses are lean, mean, infection machines. Their genomes are tiny, usually limited to a handful of absolutely essential genes, and they shed extra genomic deadweight extremely fast. Usually. Coronaviruses , including SARS-CoV-2 (the virus that causes COVID-19), appear at first glance to be an exception. They have some extra "accessory" genes in addition to the usual minimal viral set, and scientists don't know what most of them do. Scientists believe these

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