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Published online 19 December 2005 | Nature | doi:10.1038/news051219-3

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Timeline of a controversy

A chronology of Woo Suk Hwang's stem-cell research.

Concerns about ethics, errors (accidental or intentional) and possible fraud have dogged the stem-cell researcher Woo Suk Hwang, from Seoul National University in South Korea, since his landmark 2004 Science paper on stem cells from a cloned human embryo. Here _news@nature.

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