Chamberlain suffered the initial injury jumping on trampolines at a Tampa-area facility with his young son.

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At least half of the damage, however, occurs hours later, as the initial injury sets off a complex and poorly understood chemical cascade that disables surrounding cells.

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The researchers said the early introduction of the cells might even interrupt the typical "chain reaction" of tissue damage which follows a stroke, in which the initial injury harms additional cells in surrounding areas.

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Instead, the infection seemed to turn up somewhere between the initial site of injury and when they arrived in a hospital such as Brooke Army Medical Center or Walter Reed Army Medical Center stateside.

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Messi netted at the start of injury time after an initial block by Forster but Barca could not repeat the last-gasp heroics of Celtic's visit to the Nou Camp last month, when Vilanova's team snatched a 2-1 victory.

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Should this injury last longer than the initial diagnosis or limit the effectiveness of the ace, Greinke too may face questions about his contract.

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