Three big banks sought Friday to burst fears about a business lending bubble. Top executives with Comerica, Fifth Third Bancorp and U.S. Bancorp assured investors at an RBC Capital Markets conference in Boston that corporate lending remains safe and lucrative.

There are mounting fears that loan-starved banks may be pursuing business borrowers with the same reckless abandon that caused the subprime mortgage crisis. The message from three of the biggest and most aggressive commercial lenders in the country: Don't worry.

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