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Citigroup Inc. will acquire the banking operations of Wachovia Corp. in a deal facilitated by the Federal Deposit Insurance Corp.

Citigroup will absorb up to $42 billion of losses in the deal, with the FDIC covering any remaining losses, the government agency said Monday. Citigroup also will grant the FDIC $12 billion in preferred stock and warrants.

Wachovia has been among the banks hardest hit by the ongoing crisis in the mortgage market. It was suffering from mounting mortgage losses linked to its ill-timed 2006 acquisition of mortgage lender Golden West Financial Corp. It paid roughly $25 billion for Golden West at the height of the nation's housing boom. With that purchase, Wachovia inherited a deteriorating $122 billion portfolio of Pick-A-Payment loans, Golden West's specialty, which let borrowers skip some payments.