The fund invests at least 80% of its assets in corporate debt securities, including convertible debt securities. Although the fund will invest primarily in U.S. dollar denominated securities with a minimum rating in the lowest investment grade category at the time of purchase, it may invest up to 20% of its assets in debt securities that are below investment grade, also known as high yield securities or "junk bonds," and non-U.S. dollar denominated foreign debt securities.