(New York, NY) -- Some of the testosterone found in a urine sample from Tour de France champion Floyd Landis is synthetic and not natural as Landis has claimed. That`s according to "The New York Times," which quotes a source at the International Cycling Union. The finding contradicts what Landis said after last week`s disclosure that he tested positive for elevated testosterone during the annual race. Last Friday, Landis said the elevated testosterone level was not the result of doping but a "natural occurrence." If tests on a second sample prove the presence of synthetic testosterone, Landis will be stripped of his title.