Hide and seek signals

The white blood cells that fight disease and help our bodies heal are directed to sites of infection or injury by 'exit signs' – chemical signals that tell them where to pass through the blood vessel walls and into the underlying tissue. New research at the Weizmann Institute, which appeared in Nature Immunology online, shows how the cells lining blood vessel walls may act as 'selectors' by hiding the signals where only certain 'educated' white blood cells will find them.

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