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A colorized transmission electron micrograph shows H1N1 influenza virus particles. Surface proteins on the virus particles, which are targeted by flu vaccines, are shown in black. National Institute of Allergy and Infectious Diseases photo
A colorized transmission electron micrograph shows H1N1 influenza virus particles. Surface proteins on the virus particles, which are targeted by flu vaccines, are shown in black. National Institute of Allergy and Infectious Diseases photo

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Photo by:  |  VIRIN: 979527-I-YXP37-070.jpg