Examlex
Neutron stars are the size of _ .
Different Viruses
Various types of viruses that can cause a range of illnesses, from the common cold to more severe diseases like HIV/AIDS.
Immunity
The body's ability to resist or protect against infectious diseases, typically achieved through the presence of antibodies.
Leukocytes
White blood cells that are part of the immune system, responsible for protecting the body against both infectious disease and foreign invaders.
Antigens
Substances or toxins that are recognized by the immune system, triggering an immune response.
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