Banc One Corp.'s home mortgage unit, seeking to boost lending volume in an increasingly tough business, is turning to some of its biggest rivals for help.

Banc One Mortgage, Indianapolis, has begun supplementing its own mortgage menu with products from Citicorp, GE Capital, and other lenders. The program, which had been in a pilot stage until this week, is slated to be offered through the parent company's 1,500 bank branches in 12 states.

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