PITTSBURGH - Mellon Bank Corp. said its jumbo mortgage group, Boston Co., has introduced two adjustable-rate jumbo mortgages with interest rates that can readjust every month. Boston Co.'s jumbos are for $250,000 or more.

One model is based on the prime rate, and the other follows the rate on one-month certificates of deposit in the secondary market. Both rates are published daily in The Wall Street Journal.

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