Using super-resolution fluorescence microscopy, medical scientists have been able for the first time to see the inner workings of T-cells, the front-line troops that alert our immune system to go on the defensive against germs and other invaders in our bloodstream. The discovery overturns prevailing understanding, identifying the exact molecular "switch" that spurs T-cells into action -- a breakthrough that could lead to treatments for a range of conditions from autoimmune diseases to cancer.
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