Francis Crick's family is auctioning off the Nobel Prize medal and diploma that he won in 1962 for discovering the structure of DNA.

Heritage Auctions, the auction house handling the sale, estimates the value of the 23 carat medal to be around $500,000. Heritage describes it as "housed in an elegant, yet simple, red leather case with Crick's initials giltstamped on the top, surrounded by a decorative border, also in gilt."

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