This should help researchers focus on the specific immune-system problems that underlie the disease.

ECONOMIST: Human genomics

Two specific types of immune system cell that attack invaders - CD4 T-cells and natural killer cells - increased in number with age, with a higher rate of increase in women than in men.

BBC: Biological clue to why women live longer than men

Their experiments on mice showed the virus impaired the ability of a specific part of the immune system, called regulatory T cells, to calm inflammation.

BBC: Crippling viral infections 'cause asthma'

They are part of a new breed of drugs that hit specific molecular components of the immune system.

FORBES: Magazine Article

Once injected, the protein-nicotine combo triggers the immune system to create nicotine-specific antibodies.

FORBES: A nicotine vaccine may help smokers stop for good.

They're diagnosing more serious conditions--such as cancer, immune-system disorders and memory loss--that have been linked to specific mycotoxins.

FORBES: Dr. Mold