Louise Tilley

Senior research scientist, NHS Blood and Transplant

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Last updated Sep 20, 2026

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Researchers identify new blood group MAL, ending 50-year search

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As of September 2026: Led the team that identified the MAL gene behind AnWj-negative blood

In 1972, blood from a pregnant woman showed red cells missing a surface marker everyone else carried. It took until 2024 to trace that marker to a gene called MAL, establishing a new human blood group system.

Updated Sep 20