Immune system: 'Natural killers' have a memory too

US scientists have discovered that a component of the immune system that was previously deemed a blunt weapon against microbes turns out to be rather sophisticated with a memory of past invaders.

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<p><a href="http://www.physorg.com/news150906771.html">Immune system: 'Natural killers' have a memory too</a></p> <p> US scientists have discovered that a component of the immune system that was previously deemed a blunt weapon against microbes turns out to be rather sophisticated with a memory of past invaders.</p>