Evolution of Flu Viruses, 1918-2009 (6830073073)
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Description: Genetic relationships among human and swine influenza viruses, 1918-2009. Red arrows indicate human influenza virus lineages, black arrows swine influenza virus lineages, and gray arrows exportation of one or more genes from the avian influenza A virus gene pool. Horizontal bars shown inside the virus represent each of the eight virus genes, abbreviated PB2, PB1, PA, HA, NP, NA, M and NS. Credit: NIAID. Date: 6 February 2012, 10:21. Source: Evolution of Flu Viruses, 1918-2009. Author: NIAID.
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