The fund normally invests at least 80% of its net assets in the common stocks of companies engaged in the research, development, production, or distribution of products or services related to health care, medicine, or the life sciences (collectively termed "health sciences"). While the fund can invest in companies of any size, the majority of fund assets are expected to be invested in large- and mid-cap companies. The fund may invest up to 35% of its total assets in foreign stocks, which include non-dollar denominated securities traded outside the U.S.