Vitor Belfort dropped out of his upcoming UFC middleweight title shot on Thursday a few hours after the Nevada Athletic Commission banned testosterone replacement therapy. Belfort was scheduled to fight 185-pound champion Chris Weidman at UFC 173 on May 24. His title shot was given to Lyoto Machida by UFC President Dana White. UFC 173 is the next major card in Las Vegas, the UFCs hometown. The influential Nevada commission voted unanimously on Thursday to stop granting therapeutic use exemptions for TRT, closing a widely criticized loophole that allowed mixed martial arts fighters to compete on steroids. "As other jurisdictions may follow suit, I am going to drop my TRT program and compete in MMA without it," Belfort said in a statement provided to Fox, the UFCs broadcast partner. "Given the time constraints involved between now and my proposed next bout in May, I have determined not to apply for a license to fight in Nevada at this time." The 36-year-old Belfort has been open about his use of synthetic testosterone in recent years. His sanctioned steroid use has coincided with a career resurgence for the former UFC light heavyweight champion, who won three consecutive bouts by early-round knockout in 2013 while fighting in his native Brazil. Belfort claimed he needed TRT because of low testosterone, an argument which generated wide criticism because he failed a drug test for elevated testosterone in 2006 following a bout in Las Vegas for the Pride promotion against Dan Henderson, another acknowledged TRT user. Use of performance-enhancing drugs can lower the users natural testosterone levels. Belfort hadnt fought in Nevada since February 2011, before his announced TRT use began. He had intended to apply for an exemption to use synthetic testosterone before UFC 173. White and the UFC have been increasingly critical of TRT use in recent months, with White telling The Associated Press in January he supported the elimination of therapeutic use exemptions for testosterone. White hailed the Nevada commissions ruling Thursday. "We believe our athletes should compete based on their natural abilities and on an even playing field," White said. "We also intend to honour this ruling in international markets where, due to a lack of governing bodies, the UFC oversees regulatory efforts for our live events. We encourage all athletic commissions to adopt this ruling." The Nevada commission had granted therapeutic use exemptions for several fighters in recent years, including contenders Chael Sonnen and Frank Mir, but had never approved synthetic testosterone for a fighter who had failed a drug test for anabolic steroids. Machida is another former UFC light heavyweight champion from Brazil. He is getting a title shot against Weidman in just his third bout at 185 pounds after winning four of his last five fights overall. Weidman took the title from longtime UFC champion Anderson Silva last July and defended it in a rematch in December when Silva broke his leg while kicking Weidmans knee. Weidman has been critical of Belforts testosterone use, once saying Belfort "looks like the Hulk now" and hoping the UFC wouldnt schedule their bout in Brazil, where drug testing is considered much less stringent than in the U.S. Custom Arizona Diamondbacks Jerseys . 28 with a Vancouver entry for the first time in 10 years and a novel new collective bargaining agreement. Randy Johnson Jersey .Y. -- Phil Jackson lost out on his preferred coach, but hes working hard on keeping his star player. http://www.diamondbackssale.com/diamondb...greinke-jersey/. As if he had been rehearsing it, Vasquez looked around with a grimacing stare as he clinched two fists and flexed his muscles. 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He appears to be in no danger of missing the World Cup finals in Brazil beginning in mid-June — the worst-case scenario according to Uniteds diagnosis is that Van Persie is out until the start of May, leaving him available for the last two or three league games in Uniteds season. Van Persie, who has scored 23 goals in 29 games for club and country this season, was carried off on a stretcher after hurting his knee in a challenge from behind toward the end of Wednesdays 3-0 victory over Olympiakos, in which he scored a hat trick to send his teeam into the last eight.dddddddddddd United is seventh in the Premier League after its humiliating 3-0 loss to Liverpool last weekend, 12 points adrift of fourth-place Manchester City having played two more games. A finish in the top six would qualify United for next seasons Europa League, and sixth-place Everton is three points ahead with a game in hand. It will be a second significant spell on the sidelines for Van Persie this season — he played just two games across 2 1/2 months over the turn of the year because of groin then thigh problems. The news punctures some of the optimism that has spread through Old Trafford after the victory over Olympiakos, which came just as the pressure was beginning to build on manager David Moyes. Moyes has Danny Welbeck and Javier Hernandez as alternatives up front to partner Wayne Rooney. Otherwise, Moyes could decide to play Rooney as his main striker and move Juan Mata, signed in January for a record fee of 37.1 million pounds ($61.2 million), into his favoured No. 10 role just in behind. Mata has played out wide in recent games, to little effect. 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