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Jon Jones tested positive for estrogen blockers, is temporarily suspended by NAC

Esther Lin, MMA Fighting

The banned substances which threw UFC 200 into a state of upheaval have been formally revealed.

Former UFC light heavyweight champion Jon Jones tested positive for Hydroxy-clomiphene, an anti-estrogenic agent, and Letrozole metabolite, an aromatase inhibitor, during a June 16 out-of-competition drug test administered by USADA, according to multiple reports.

The Nevada Athletic Commission revealed the findings at Monday's meeting in Las Vegas. Both Rashad Evans (for CBS Sports) and Chael Sonnen (on Joe Rogan's podcast) previously reported Jones popped for estrogen blockers.

The commission unanimously issued Jones a temporary suspension pending a full hearing, which will be held at a date to be determined, likely in September or October.

Jones and the UFC were informed of the test failure on July 6, three days before Jones was scheduled to headline UFC 200 against Daniel Cormier. Jones was pulled from the bout and Cormier eventually met Anderson Silva in a non-title fight, which Cormier won via unanimous decision.

Jones has retained the services of Southern California attorney Howard L. Jacobs to fight the case. Jacobs is a noted anti-doping attorney whose clients include cyclist Floyd Landis, sprinter Marion Jones and basketball star Diana Taurasi.

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