The Fund invests primarily in equity securities, principally common and preferred stocks of companies of any market capitalization. Under normal market conditions, the Fund invests at least 80% of its net assets, plus borrowings for investment purposes, in securities of companies principally engaged in the research, development, production, or distribution of products and services related to the health care industry (health care companies). Health care companies may include, for example, manufacturers of health care equipment and supplies, health care services providers, pharmaceutical companies, biotechnology and life sciences companies, and suppliers of technologies for use by health care companies. The Fund may invest in issuers of all market capitalizations, including larger, established issuers and newer companies with little or no current revenues. The Fund may invest in foreign securities (including through investment in depositary receipts), with such investments typically representing less than 35% of the Funds net assets.