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With Citigroup (C) snapping up an ailing Wachovia (WB) on Sept. 29, just days after JPMorgan Chase (JPM) plucked Washington Mutual's (WM) banking assets from failure, the remaining large banks are about to become behemoths. Here's a look at the 10 largest U.S. retail banks still left—for now. (All data are from the Federal Deposit Insurance Corp. or the banks as of June 30, 2008, unless otherwise noted; data on mortgage losses are from Bloomberg.)