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James Watson, who co-discovered the double-helix structure of DNA in 1953, has died at age 97.

Born in Chicago in 1928, Watson made the groundbreaking discovery at just 24 years old alongside British physicist Francis Crick. Watson died in hospice care after a brief illness, his son confirmed Friday, according to The Associated Press.

“As a scientist, his and Francis Crick’s determination of the structure of DNA, based on data from Rosalind Franklin, Maurice Wilkins and their colleagues at King’s College London, was a pivotal moment in the life sciences,” Cold Spring Harbor Laboratory, Watson’s former research institution, said in a statement Friday.

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Watson died earlier

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