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Hello.
Imagine looking at a map of a city you thought you knew inside out,
only to discover entire neighbourhoods that no one had ever realised existed.
My guest today has done something rather similar in genetics.
Edith Hurd has forged new paths in epigenetics, put simply the science around how our genes are switched on and off.
She's spent her career studying the mechanisms
that make us who we are and transforming our understanding of how X chromosomes are expressed.
Today, Edith is director of London's Francis Crick Institute and holds the chair of epigenetics
and cellular memory at the Collège de France in Paris.
Her career has taken her to the cutting edge of European science
and earned her honours including France's highest scientific distinction, the CNRS gold medal.