He wanted the Europeans to take a lead and so put down a marker for the future.

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Benjani soon wasted a glorious opportunity to extend City's lead, spinning away from his marker with a sublime first touch before blazing over with his second from six yards out.

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They added that further research could examine if decreased amygdala volume in cocaine addicts represents a marker for illness that could lead to the identification of genes that modify the risk for addiction.

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"Alcohol was frequently positioned as a marker of the weekend, and a hangover as a marker of a good night out, " said lead researcher Professor Norma Daykin.

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Hamilton regained the lead 15 minutes later, with just under an hour remaining in the session, and he twice improved his own marker before Kovalainen's late intervention.

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However, consistent pressure in the second-half paid its dividends as Taylor rounded his marker to fire into the corner of the net to put Ghana back firmly on a 3-2 lead in the 58th minute.

BBC: Ghana