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World record holder Usain Bolt of Jamaica poses after a news conference ahead of the IAAF World Athletics Championships in Daegu August 25, 2011. REUTERS/Lee Jae-Won

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Bolt primed as world championships open

DAEGU, South Korea (Reuters) - Injury pull-outs and doping absentees have taken the sheen off the men's 100 meters race at the world athletics championships this year, but all that will be forgotten when Usain Bolt brings his sizzling charisma to the track on the opening day in Daegu Saturday.