The fund normally investing at least 80 percent of assets in investment-grade securitized debt securities (those of medium and high quality) and repurchase agreements for those securities. Investing in securitized debt securities (including mortgage-backed securities, commercial mortgage-backed securities, and other asset-backed securities) issued by the U.S. Government and its agencies or instrumentalities, foreign governments, and corporations. Investing in U.S. Government securities issued by entities that are chartered or sponsored by Congress but whose securities are neither issued nor guaranteed by the U.S. Treasury. Managing the fund to have similar overall interest rate risk to the Bloomberg U.S. Securitized Index. Allocating assets across different market sectors and maturities. Investing in domestic and foreign issuers.