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  • Trojan Micro Horses

    Trojan Micro Horses

    Image of the Week

    Spheres made from sugar polymers hide insulin-producing cells from attack by the immune system.

  • Measles Outbreak

    Measles Outbreak

    Image of the Week

    The measles virus can spread easily among people who have no immunity against it, as the current outbreak shows.

  • Attacking AIDS from Within

    Attacking AIDS from Within

    Image of the Week

    Killer T-cells captured in the act of destroying HIV-infected cells.