This is Science Today. Viruses are very tricky and
exist for one purpose only - to reproduce. To do
that without being foiled by the immune system,
they have rapidly evolving evasive strategies. But
it seems the immune system can be just as tricky
in their counter-attacks. Dr. Lewis Lanier of the
University of California, San Francisco, discovered
the first genetic evidence of the embattled immune
system's attack against viral invaders.
Narrator: For Science Today, I'm Larissa Branin.