* Brailsford defends Wiggins and Team Sky * Sky 'do not cross the line', says Briton (Adds more detail) LONDON, Sept 26 (Reuters) - Dave Brailsford defended Bradley Wiggins and Team Sky on Monday over the 2012 Tour de France winner's use of medical exemptions to receive legal injections of a banned drug ahead of three major races. "It was not being used to enhance performance," the general manager told the BBC, adding that Team Sky "do not cross the line" when it comes to performance-enhancing drugs. Brailsford said Sky would seek to be more transparent in future about riders' use of Therapeutic Use Exemptions (TUEs). More...