Barred From 400 Meters, Namibia’s Mboma Wins Silver in the 200

Christine Mboma and a teammate were declared ineligible for the longer race because of a genetic condition that raises their testosterone levels. The rule has generated controversy.

By Scott Cacciola and Jeré Longman

TOKYO — As Christine Mboma of Namibia moved up from fifth place toward a silver medal in the homestretch of the women’s Olympic 200 meters on Tuesday, she began screaming in what appeared to be a mix of exertion and elation.

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