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Raising the Alarmin
29 March 2012

Raising the Alarmin

At the front line of mammalian defence against viruses are special white blood cells known as T-cells. T-cells can seek out and destroy those of our cells that have succumbed to viral infection. Here we see the aftermath of a battle with a viral infection fought on a microscopic scale in mouse spleen cells. An ultra-fine sliver of spleen is shown here with nuclei stained blue (white box, magnified top left, measures 1/200 cm across). Following infection with a virus, some of these spleen cells sent out a chemical distress signal called an alarmin (in this case a specific protein called interleukin-33 shown in green). The signal effectively rallies the troops – a cavalry of protective T-cells (here coloured red) – to prevent the virus from advancing.

Written by John Ankers

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BPoD stands for Biomedical Picture of the Day. Managed by the MRC Laboratory of Medical Sciences until Jul 2023, it is now run independently by a dedicated team of scientists and writers. The website aims to engage everyone, young and old, in the wonders of biology, and its influence on medicine. The ever-growing archive of more than 4000 research images documents over a decade of progress. Explore the collection and see what you discover. Images are kindly provided for inclusion on this website through the generosity of scientists across the globe.

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