Up to 100,000 patients with cancer and rare diseases in England are to have their entire genetic code sequenced.
The Prime Minister will announce £100m has been set aside for the project over the next three to five years.
The aim is to give doctors a better understanding of patients' genetic make-up, condition and treatment needs, and help develop new cancer treatments.
One human genome contains three billion base pairs - the building blocks of DNA.
Sequencing the code produces a huge amount of data. Although the price is falling fast, it currently costs £5,000 to £10,000 - which explains why no country in the world has embarked on mass DNA mapping on this scale.
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Cancer related links produced by Pulitzer Center / PRI's The World .
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