Chronic Infection Now Clearly Tied To Immune-system Protein

A new study finds the cross-talk between 'killer T-cells' and 'helper T-cells' can only happen in the presence of interleukin-21, a powerful immune-system protein. Researchers say if interleukin-21 is missing, the immune system's anti-viral efforts fail. The study mice were treated for lymphocytic choriomeningitis.

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