Russia's Natalya Antyukh has been stripped of 400m hurdles gold from London 2012 on the basis of historical data from a Moscow testing laboratory.Antyukh, now 41, is already serving a four-year ban after being named in a World Anti-Doping Agency (Wada) investigation into cheating by Russia.American Lashinda Demus will be promoted to gold in her place.
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