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Probably because fish are more advanced biologically.
An immunologist
Crohn's disease is an auto-immune disorder where the immune system attacks the cells of the small intestines. It is treated by monthly infusions of Remicade, which suppresses the immune system.
your immune system and your White blood cells produce antibodies
T-cells
Memory B-cells
T-cells
No, AIDS stands for Acquired Immune Deficiency Syndrome, and is a disease of the immune system caused by a virus, not a cancer. It does progressively reduce the effectiveness of the immune system and leaves individuals susceptible to opportunistic infections and tumors.
Acquired Immune System or Adaptive immune System
An immune response is part of the body's defense against pathogens in which cells of the immune system react to each kind of pathogen with a defense targeted specifically toward that pathogen.
The Immune System
Be specific, what kind of jellyfish? For a Box Jellyfish, it is some sort of neurotoxin.