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SAN FRANCISCO, June 23 (Reuters) - U.S. stock index futures opened higher on Thursday after polls closed in Britain with early signs that the "remain" campaign is leading in the country's EU membership referendum.
S&P 500 e-mini futures were up 0.43 percent. Earlier on Thursday, U.S. stocks rallied as Wall Street bet strongly that Britons would vote to remain part of the European Union, potentially avoiding a hit to European trade and its consequences to global economic growth. (Reporting by Noel Randewich; Editing by Chizu Nomiyama)