Fannie Mae and Freddie Mac shares fell sharply Tuesday as the market fretted over Federal Reserve Chairman Alan Greenspan's comments that the benefits conferred by the government on the two mortgage buyers should be reviewed.

While other financial stocks rallied, Fannie's shares fell as much as 7% during the day and closed at $57.125, off 5.19%. Freddie's stock fell more than 7% before closing at $42.9375, off 6.15%.

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