The fund normally invests at least 80% of assets in securities of companies with medium market capitalizations (which, for purposes of this fund, are those companies with market capitalizations similar to companies in the Russell Midcap® Index or the S&P MidCap 400® Index). It invests primarily in common stocks. The fund potentially invests in companies with smaller or larger market capitalizations. It invests in domestic and foreign issuers. The fund invests in either "growth" stocks or "value" stocks or both.