By Angela Moon NEW YORK (Reuters) - U.S. stocks pulled back on Tuesday after Federal Reserve Chair Janet Yellen and her fellow Fed policymakers raised concerns about "substantially stretched valuations" in some sectors. "These are the sub-industries that have caused a lot of longtime stock watchers to scratch their heads," said Kim Forrest, senior equity analyst at Fort Pitt Capital Group in Pittsburgh. The Dow Jones industrial average rose 5.26 points or 0.03 percent, to end at 17,060.68, not far below the record closing high of 17,068.26 set on July 3. BlackBerry's U.S.-listed shares plunged 4 percent to $10.85 after the bell following news that International Business Machines Corp will partner exclusively with Apple Inc to sell iPhones and iPads loaded with applications intended to serve corporate clients.



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