In an effort to ward market timers from an aggressive growth fund, American Century Investments will give only stock to investors who cash out of the product without first giving 15-days notice.

The American Century Avanti Fund won't be available to investors until at least early next year, said Chris Doyle, a spokesman for the firm. But the fund is already drawing attention because of American Century's unique approach to keeping market timers away from the product and the firm's insistence that investors stick with the product for at least five years.

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