• Emeritus Professor of Endocrinology, St Thomas' Hospital and King's College, London; Visiting Professor, University of Southampton
Caster Semenya was withdrawn from competition in 2009 on the basis that her higher-than-normal testosterone level conferred a performance advantage. Reuters/Mike Hutchings

Fair play at the Olympics: testosterone and female athletes

Until recently, women with higher-than-expected testosterone levels were declared ineligible to take part in track and field athletics.

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